Answer:
Natural selection is one of the central mechanisms of evolutionary change and is the process responsible for the evolution of adaptive features. Without a working knowledge of natural selection, it is impossible to understand how or why living things have come to exhibit their diversity and complexity. An understanding of natural selection also is becoming increasingly relevant in practical contexts, including medicine, agriculture, and resource management. Unfortunately, studies indicate that natural selection is generally very poorly understood, even among many individuals with postsecondary biological education. This paper provides an overview of the basic process of natural selection, discusses the extent and possible causes of misunderstandings of the process, and presents a review of the most common misconceptions that must be corrected before a functional understanding of natural selection and adaptive evolution can be achieved.
which of the following cells or substances particpates in non-specific immune defenses? natural killer cells antibodies cytotoxic t cells none of the above
White blood cells, or leukocytes, come in a variety of forms and function to safeguard and secure the human body. Leukocytes move through the circulatory system to monitor the complete body.
Innate defense system leukocytes include the following cells:
Phagocytes, also known as phagocytic cells: Phagocyte is an abbreviation for "eating cell," which defines the function phagocytes perform in the immune reaction. Phagocytes circulate throughout the body, engulfing and destroying possible dangers such as bacteria and viruses. Phagocytes are like security officers on duty.
Macrophages: cells that can exit the circulatory system by traveling across capillary artery walls. It is critical to be able to move outside of the vascular system because It enables macrophages to seek viruses with fewer restrictions. Macrophages can also release cytokines to communicate and recruit other cells to a pathogen-infested region. Mast cells are: Mast cells are located in mucous membranes and connective tissues and play an essential role in wound healing and pathogen protection via the inflammatory response. Mast cells that are triggered produce cytokines and granules containing chemical molecules, resulting in an inflammatory reaction. Histamine, for example, causes blood arteries to dilate, boosting blood flow and cell trafficking to the site of infection. The cytokines produced during this process serve as messengers, signaling other immune cells, such as neutrophils and macrophages, to travel to the site of infection or to be on the lookout for infection., or to be on the lookout for spreading threats. Neutrophils are phagocytic cells that are also categorized as granulocytes due to the presence of granules in their cytoplasm. These granules are extremely toxic to bacteria and fungus, causing them to cease growing or perish upon touch. A healthy adult's bone marrow generates roughly 100 billion new neutrophils per day. Because there are so many neutrophils in circulation at any given moment, they are usually the first cells to appear at the location of an infection. Eosinophils are granulocytes that attack multicellular pathogens. Eosinophils produce a variety of extremely toxic proteins and free radicals that destroy microbes and parasites. During allergic responses, the use of toxic proteins and free radicals also produces tissue injury, soTo avoid needless tissue injury, eosinophil activation and toxin release are tightly controlled.
While eosinophils account for only 1-6% of white blood cells, they can be found in a variety of places, including the thymus, lower gastrointestinal system, ovaries, uterus, liver, and lymph nodes.
Basophils are another type of granulocyte that attacks complex pathogens. Basophils, like mast cells, secrete histamine. Because histamine is used, basophils and mast cells become important actors in mounting an allergic reaction.
Natural killer cells do not actively target pathogens. Natural killer cells, on the other hand, eliminate infected host cells in order to halt the spread of an illness. Through the expression of particular receptors and antigens, infected or compromised host cells can trigger natural kill cells for elimination. Dendritic cells are antigen-presenting cells found in tissues that can communicate with the outside world via the epidermis, the interior mucosal membrane of the nostrils, the lungs, the stomach, and the intestines. Dendritic cells can detect threats and serve as couriers for the rest of the immune system by antigen presentation because they are found in tissues that are frequent sites of early infection. Dendritic cells also serve as a link between the innate and adaptive defense systems.
in the developing world, agricultural production is . multiple select question. depleting natural resources insufficient to meet the needs of the population being revolutionized by biotechnology not sustainable for the long term
In the developing world, agricultural production is depleting natural resources and is not sustainable for the long term.
Thus, the correct options are A and D.
In developing world, аgriculture continues to be the mаin source of employment, livelihood аnd income for between 50-90% of the populаtion. Of this percentаge, smаll fаrmers mаke the up the mаjority, up to 70-95% of the fаrming populаtion. They hаve trаditionаlly survived on subsistence production. They also hаve experimented with export crops with occаsionаl initiаl success but mаny disаstrous fаilures.
Sustаinаble аgriculture must nurture heаlthy ecosystems аnd support the sustаinаble mаnаgement of lаnd, wаter аnd nаturаl resources, while ensuring world food security.
Your options aren't well arranged, but most probably your options were
A. depleting natural resources
B. insufficient to meet the needs of the population
C. being revolutionized by biotechnology
D. not sustainable for the long term
Thus A and D are the correct options.
For more information about agricultural production refers to the link: https://brainly.com/question/17711566
#SPJ11
red blood cells have a higher proportion of aquaporins on the membrane than skin cells do. assuming equal osmotic pressures, which is true?
Red blood cells osmose at a quicker rate than skin cells.
Which of the following is carried across the cell membrane actively?Metal ions, such as Na+, K+, Mg2+, and Ca2+, are transported across the cell membrane through primary active transport. Ion pumps or ion channels are required to cross membranes and distribute charged particles throughout the body.
The diffusion of a solvent through a semipermeable membrane is described by osmosis. Water, the most common solvent in biological systems, migrates from higher concentrations to lower concentrations.
Diffusion occurs when particles migrate from a higher concentration area to a lower concentration area until equilibrium is attained. A semipermeable membrane is present in osmosis.
learn more about osmosis
https://brainly.com/question/2625460
#SPJ1
what creates the pressure gradient that regulates blood flow in the venous system? select all that apply.
The pressure gradient that regulates blood flow in the venous system is created by a combination of factors, including gravity, the pumping action of the heart, the contraction of muscles in the walls of the veins, and valves within the veins that ensure that blood flows in only one direction.
The pressure gradient that regulates blood flow in the venous system is created by several factors. These factors include skeletal muscle contractions, one-way venous valves, and respiratory movements.
Skeletal muscle contractions exert pressure on the veins and aid in blood flow, especially in the lower extremities. Breathing movements also contribute to the pressure gradient, as inhalation increases thoracic pressure, and exhalation decreases it. These factors work together to maintain blood flow in the venous system.
Learn more about venous system here:
brainly.com/question/14351996
#SPJ11
the migration of the mormons to utah would be an example of what type of genetic drift? founder effect bottleneck effect
The migration of Mormons to Utah would be an example of what type of founder effect genetic drift
What is a founder effect?Founder Effect refers to a process that occurs when a small subset of the original population becomes geographically isolated from the majority of the population.
Due to their geographic distance from the rest of the population, this subset of people breeds only among themselves, causing the frequency of certain genetic traits to be more common in this isolated population than in the larger population as a whole.In the case of the Mormon migration to Utah, the founder effect is observed.
When the Mormons first migrated to Utah, they were a small group that settled in a new area. They had limited interaction with the rest of the population, which means that genetic traits that were more common among Mormons were more common in Utah's population over time.
This is known as the founder effect.The bottleneck effect is a situation in which a significant portion of a population is destroyed, resulting in a decrease in the genetic variability of the population. In contrast, founder effect is caused by the isolation of a small group of people from the larger population.
See more about founder effect in:
https://brainly.com/question/24303618
#SPJ11
what was the interest in the extinct fossils versus their modern contemporaries, such as glyptodonts and armadillos, or giant ground sloths and modern sloths?
The interest in the extinct fossils versus their modern contemporaries, such as glyptodonts and armadillos, or giant ground sloths and modern sloths is typically related to their uniqueness in comparison to their modern contemporaries.
Fossils are the remains or traces of living things from the past and have been naturally preserved through various chemical and physical processes. The glyptodonts and armadillos of the past were much larger than the species that exist today. Similarly, giant ground sloths and modern sloths are similar in many ways, but giant ground sloths were much larger than their modern relatives.
The size differences between extinct and extant species may have affected their evolution, because the evolusion is the changes slowly and gradually that last a very long time.
Learn more about evolution at:
https://brainly.com/question/17193750
#SPJ11
assume that you have an antimicrobial agent specific for each of the targets listed below. indicate which type of microbe would be most susceptible to the agent by placing it in the appropriate bin.
Given the target microorganisms, the antimicrobial agent that would be most susceptible is gram-positive bacteria. Gram-positive bacteria have a thick peptidoglycan cell wall that contains less lipid, making them more vulnerable to antibiotics.
Antimicrobial agents that are specific to gram-positive bacteria, such as penicillins, vancomycin, and cephalosporins, are usually more effective than agents that target other types of microbes.
To identify which type of microbe would be most susceptible to an antimicrobial agent, you must first understand the differences between the various microbial cell walls. Gram-positive bacteria have thick peptidoglycan cell walls that contain less lipid, while gram-negative bacteria have thin peptidoglycan cell walls that contain more lipid. Gram-negative bacteria are more resistant to antibiotics than gram-positive bacteria, as the lipids can block the antimicrobial agents from entering the cell.
It is important to note that some antimicrobial agents are effective against both gram-positive and gram-negative bacteria. Such agents include aminoglycosides, quinolones, and polymyxins. In addition, some agents are effective against fungi and other types of microbes.
For more similar questions on antimicrobial agents
brainly.com/question/17182374
#SPJ11
if this aspartic acid is changed to a different amino acid, which one of the amino acid substitutions is most likely to allow the protein to fold normally?
If aspartic acid is changed to a different amino acid, the amino acid substitution that is most likely to allow the protein to fold normally is a polar amino acid with a negative charge or a neutral amino acid.
What are amino acids?Amino acids are organic compounds that form proteins when they are linked together in a sequence. Each amino acid is made up of an amino group, a carboxyl group, and a unique side chain. The side chain distinguishes one amino acid from another and determines the amino acid's properties, such as polarity and charge. There are 20 amino acids that are used to form proteins, and they are classified based on their side chains.
What is protein folding?Protein folding is the process by which a protein chain rearranges itself into its functional form. The sequence of amino acids determines the protein's final shape, which is critical for its biological function. If a protein does not fold correctly, it can result in disease or dysfunction. Certain amino acid substitutions can affect protein folding by altering the chemical properties of the protein or interfering with the protein's interactions with other molecules.
What amino acid substitutions will allow the protein to fold normally?Amino acid substitutions that maintain the chemical properties of the original amino acid are most likely to allow the protein to fold normally. For example, aspartic acid is a polar amino acid with a negative charge. A substitution with another polar amino acid with a negative charge, such as glutamic acid, may be able to maintain the original properties of aspartic acid and allow the protein to fold normally. A neutral amino acid substitution may also be able to maintain the original properties of aspartic acid and allow the protein to fold normally.
Here you can learn more about aspartic acid
https://brainly.com/question/30714122#
#SPJ11
starch-borate and starch-glycerol polymers have been used for encapsulation of pharmaceutical drugs or pesticides. explain what effect this might have and why it would be beneficial. saved
Starch-borate and starch-glycerol polymers can be used for encapsulation of pharmaceutical drugs or pesticides to enhance their stability, solubility, and bioavailability.
The use of starch-borate and starch-glycerol polymers for encapsulation of pharmaceutical drugs or pesticides can have several benefits. Encapsulation involves the process of enclosing active ingredients (such as drugs or pesticides) within a protective coating or matrix, which can enhance their stability, solubility, and bioavailability.
Starch-borate and starch-glycerol polymers are natural, biodegradable, and non-toxic materials that have been found to be effective as encapsulation agents. These polymers can form stable and uniform coatings around the active ingredients, protecting them from environmental degradation and improving their delivery to the target site.
The use of these polymers for encapsulation can also help to reduce the toxicity and environmental impact of pharmaceutical drugs or pesticides.
Learn more about polymers here:
https://brainly.com/question/17581855
#SPJ11
how did the reintroduction of wolves to yellowstone national park affect the beaver population?(1 point)
Answer:
The wolves increased the population by eating a competitor.
Explanation:
With multiple competitors, it would decrease the population of beavers. But because wolves are being reintroduced, they're attacking other competitors and giving time for beavers to repopulate as well as decreasing the number of competitors so more beavers don't die.
what kind of experiment can help researchers tell whether differences between organisms are due genetic differences, phenotypic plasticity, or genotype-by-environment interactions?
A common garden experiment can help researchers determine whether differences between organisms are due to genetic differences, phenotypic plasticity, or genotype-by-environment interactions.
What is a common garden experiment?A common garden experiment is a method for assessing the extent to which differences between populations or genotypes in phenotypic characters arise from genetic or environmental factors. This experiment compares the performance of different genotypes when they are all exposed to the same environmental conditions in a single, controlled location.
A common garden experiment can be used to determine the effect of a single environmental variable on phenotypic differences. It is typically used to identify whether variation in a character is due to genetic differences or whether it is due to phenotypic plasticity. In this type of experiment, researchers grow different genotypes in the same location and under the same environmental conditions. They then assess the phenotypic differences between them to determine whether they are due to genetic differences or environmental factors.
Here you can learn more about phenotypic plasticity
https://brainly.com/question/30715297#
#SPJ11
which group is incorrect? organs: heart, stomach, lungs, liver ventral cavities: thoracic, abdominopelvic cavities: dorsal, ventral organ systems: circulatory, digestive, respiratory, brain]
Out of the given groups, the incorrect group is "Liver" as it does not belong to the "Organs". It belongs to the digestive system and not to the group of organs.
Organ Systems are the group of organs that work together to perform a particular function in the body. The given group of organ systems includes:
circulatorydigestiverespiratorybrainOrgans are a group of tissues that work together to perform a particular function in the body. The given group of organs includes:
heartstomachlungsThe body cavity is a space in the body that contains organs. There are two types of body cavities: ventral and dorsal. The given group of ventral cavities includes:
thoracicabdominopelvicThe thoracic cavity is located in the upper part of the trunk, whereas the abdominopelvic cavity is located in the lower part of the trunk. The dorsal cavity is a space that contains the central nervous system (CNS). Thus, the given group of dorsal cavities includes only one group, i.e., the CNS.
Liver, on the other hand, is a vital organ that plays a crucial role in detoxification, protein synthesis, and blood clotting. It belongs to the digestive system and not to the group of organ systems. Therefore, out of the given groups, the incorrect group is "Liver."
For more such questions on Liver.
https://brainly.com/question/29783273#
#SPJ11
which enzyme in the citric acid cycle is responsible for catalyzing the rate-limiting step? alpha-ketoglutarate dehydrogenase isocitrate dehydrogenase citrate synthase malate dehydrogenase
The enzyme in the citric acid cycle that is responsible for catalyzing the rate-limiting step is Citrate Synthase. The correct option is c.
What is Citrate Synthase?Citrate Synthase is a mitochondrial enzyme that catalyzes the rate-limiting step of the Krebs cycle, which is the conversion of acetyl-CoA and oxaloacetate to citrate and CoA.A key point to remember about Citrate Synthase is that it is an enzyme that catalyzes the first reaction in the Krebs cycle.
As a result, it is responsible for catalyzing the rate-limiting step in the Krebs cycle, which is the conversion of acetyl-CoA and oxaloacetate to citrate and CoA. Therefore, Citrate Synthase is the correct answer to this question.
Here you can learn more about Citrate Synthase
https://brainly.com/question/30903974#
#SPJ11
which dish is your positive control for a cellular response to testosterone, and which dish is your negative control ?
In a cellular experiment to study testosterone response, the positive control is a group of cells known to respond to testosterone, whereas the negative control is a group of cells known to not respond to testosterone.
The positive control is necessary to demonstrate that cells can respond to testosterone and to establish a baseline for cellular response.The negative control is used to ensure that any response observed in the experimental group is due specifically to the treatment with testosterone and not to other factors, such as the fetal bovine serum (FBS) used for cell culture.In general, the positive and negative controls are necessary to establish the specificity of the treatment and to guarantee the quality of the results of the experiment. Both controls are essential to establish the specificity of the treatment and to minimize the effects of other factors on the results of the experiment.
Lear More About Testosterone
https://brainly.com/question/13061408
#SPJ11
Place the following terms or examples within the correct category.
Hyaline Cartilage
Fibrocartilage
-Composes epiphyseal plates
-Attaches to ribs of sternum
-Forms articular cartilage
-Weight-bearing cartilage
-Withstands compression
-Forms intervertebral discs
Both hyaline and fibrocartilage are types of connective tissue that serve important functions in the body.
Hyaline Cartilage:
Composes epiphyseal plates Forms articular cartilage
Fibrocartilage:
Attaches to ribs of sternum Weight-bearing cartilage Withstands compression Forms intervertebral discsHyaline cartilage is found in many areas of the body, including the nose, trachea, and ends of long bones. It is characterized by its smooth, glassy appearance and ability to resist friction and wear. Hyaline cartilage forms articular cartilage, which covers the ends of bones at joints, and composes the epiphyseal plates, which enable longitudinal bone growth.
Learn more about fibrocartilage ,
https://brainly.com/question/14663126
#SPJ4
just after the peak of the action potential, what movement of ions restores the membrane to approximately the resting potential?
After the peak of the action potential, the positive ions, primarily sodium, are actively pumped out of the cell and potassium ions move in to the cell by diffusion. This restores the membrane to approximately the resting potential and this process is known as repolarization.
During an action potential, there is an influx of sodium ions into the cell, and a corresponding efflux of potassium ions out of the cell.
This influx of positive charge causes the membrane potential to become more positive, while the efflux of negative charge causes the membrane potential to become more negative.
The resulting change in the membrane potential is known as depolarization. When the membrane potential reaches its peak (at +50 mV), the influx of sodium ions stops, and potassium ions begin to move in by diffusion.
This process restores the membrane potential to the resting potential.
The resting potential is maintained by a sodium-potassium pump which actively pumps sodium out of the cell and potassium into the cell.
This active process is coupled with an unequal distribution of the ions on either side of the cell membrane, which allows the ions to diffuse back into the cell. This process, known as repolarization, brings the membrane potential back to the resting potential.
Thus, after the peak of the action potential, the movement of ions restores the membrane to approximately the resting potential. The influx of potassium ions coupled with the sodium-potassium pump restores the membrane potential to its original state.
To know more about repolarization, refer here:
https://brainly.com/question/30515285#
#SPJ11
Wildebeests: A Keystone Species Use the data provided to answer the question below in CER format. Make sure to use at least two pieces of evidence to claim and provide reasoning.
FIRE! Fire is actually an important component of savanna ecosystems. Fire kills young trees and seedlings, reducing the number of big adult trees that grow over time. Since trees compete with grasses for light and soil moisture, fire actually helps the grasses and keeps the savannas open. Dr. Rico Holdo, a professor at the University of Missouri, and his colleagues modeled and wrote about the interactions of fire, rain, grasses, trees, and the various animals in the Serengeti. The interactions get complicated quickly, but I’ll try to give you a run-down of how they see fire acting in this ecosystem. First, as I’ve mentioned, fire suppresses trees and encourages grasses. If you have both fire and rain, but no animals, then something interesting happens: the rain encourages the trees, but it encourages the grasses, too. As the grasses get taller, there is more fuel for fire, and the fires become more widespread and more damaging. These fiercer fires really hurt the trees – in fact, the damage from fires (because of more rain) is more important than the extra boost the trees get directly from the rain. So more rain actually means fewer trees. With me so far? We’re now going to throw animals into the mix – well, at least some of the animals. Let’s talk about the grazers. The grazers eat the grass, and this reduces the fuel available to fire. If you have a lot of grazers, like we do in the Serengeti, the grass height is reduced a lot. That means fewer fires and that rain once again helps the trees. Further, many of the grazers are migratory and move around the landscape a lot. They don’t eat the savanna grasses in a neat, tidy, organized way. Instead, they create a patchy mosaic of grass heights, and with those different grass heights come different susceptibility of patches of grass to burn. With rain and fire and grazers, we now have a landscape of grasses of different lengths, patchy fires, and some areas dense with trees and some areas with fewer trees. All that variation means more diversity – more diversity of the grasses, plants, and trees, and more diversity of the animals that rely on them. All that diversity is due, in part, to fire.
A Keystone species is a plant or animal that plays an important and unique role in how the ecosystem functions without the key stone species to ecosystem would be very different. One scientist identified Keystone specie it to look as how changes to their abundance (number ) affect other organisms. Often, there are many indirect effects of changes to ecosystems.
Claim The wildebeest in the Serengeti are a keystone species.
What evidence supports this claim? (Make sure to provide reasoning)
if you compare the chromosomes of a cell as it enters interphase with the same chromosomes just before the cell begins mitosis, a key difference would be .
The comparation the chromosomes of a cell as it enters interphase with the same chromosomes just before the cell begins mitosis, a key difference would be during interphase, the chromosomes are in a loose and uncoiled form, while just before mitosis the chromosomes become condensed and coiled. This difference is key for the cell to be able to divide properly.
During interphase, the chromosomes are in a loose and uncoiled form, which allows the cell to carry out its regular metabolic activities. However, just before the cell enters mitosis, the chromosomes become condensed and coiled, making them easier for the cell to divide into two daughter cells. This condensation is important for the cell to divide correctly and ensures that each daughter cell will receive the correct number of chromosomes.
Learn more about mitosis at:
https://brainly.com/question/29765099
#SPJ11
the three most common shapes of bacteria are a. cubical, spherical, and rod-shaped. b. spirillum, endospore, and peptidoglycan. c. bacillus, spirillum, and coccus. d. spirillum, nucleiod, and peptidoglycan. e. cubical, spiral, and thread-like.
The three most common shapes of bacteria are cubic, spherical, or rod-shaped. Bacillus species are rod-shaped, gram-positive, aerobic or facultatively anaerobic bacteria that produce endospores. Option a is Correct.
In some species, cultures have the potential to mature into gram-negative forms. The genus' many species have a wide range of physiological traits that enable them to coexist in various types of natural habitats.
A rod-shaped bacteria or archaeon is known as a bacillus (plural bacilli), often known as a bacilliform bacterium or frequently just a rod (where the context makes the concept apparent). Bacilli can be found in a wide range of bacterial taxonomic groupings. Bacillus, which has a rod form, coccus, which has a spherical shape, and spirillum are the three primary morphologies of bacteria (spiral-shaped).
Learn more about bacteria Visit: brainly.com/question/6941760
#SPJ4
the process in which enzymes within neurons convert precursors into neurotransmitter molecules is called group of answer choices
The process in which enzymes within neurons convert precursors into neurotransmitter molecules is called neurotransmitter synthesis. Neurotransmitter synthesis is a vital part of communication between neurons, allowing for the electrical signals in the brain to be translated into meaningful information.
In order for neurotransmitter synthesis to occur, precursors, such as tyrosine, tryptophan, and choline, must first be taken up by neurons. These precursors then enter the nerve terminal and are converted into active neurotransmitters by enzymes. Examples of neurotransmitters include serotonin, dopamine, and norepinephrine.
The neurotransmitters produced by the enzymes are then released into the synaptic cleft. Once released, they bind to receptors on the postsynaptic neuron and send electrical signals that allow neurons to communicate with each other. This is the main mechanism by which neurons in the brain send and receive information.
The process of neurotransmitter synthesis is vital for the proper functioning of the nervous system, as it allows for electrical signals in the brain to be translated into meaningful information. Without neurotransmitter synthesis, the brain would not be able to properly communicate and process information.
To know more about neurotransmitter synthesis refer to-
https://brainly.com/question/24153260#
#SPJ11
during a growth curve of aliivibrio fischeri, when would you expect to see the strongest bioluminescence?
During a growth curve of Aliivibrio fischeri, you would expect to see the strongest bioluminescence in the exponential growth phase.
This is when the population of bacteria is multiplying at a rapid rate and is able to utilize available resources to grow quickly. The production of bioluminescence is linked to the availability of energy sources and, as the population increases, the bacteria can generate more energy and thus produce more light.
This peak in bioluminescence usually occurs shortly after the start of exponential growth and then tapers off as resources start to become limited.
To learn more about growth, click here:
https://brainly.com/question/28789953
#SPJ11
what is the process in which two closely interacting species jointly act as selective agents of traits for each other
The process in which two closely interacting species jointly act as selective agents of traits for each other is known as coevolution.
Coevolution is the process in which two or more closely interacting species influence each other's evolution. The evolution of one species is determined by the other species in this case. Coevolution can take many forms, including symbiosis, predation, and mutualism.Coevolution can be defined as the change in the genetic structure of one species as a result of the selection pressure exerted by another species. This phenomenon arises from the fact that species that depend on each other for survival, particularly predator-prey and host-parasite relationships, have an enormous impact on each other's evolution.
The interactions between different species can result in the development of a wide range of characteristics. For example, predators and prey have coevolved a range of adaptations that aid them in the hunt and escape. Pollinators and the plants they feed on have coevolved in order to optimize pollination efficacy. Mutualistic species, on the other hand, have coevolved in order to maximize the benefits of the relationship for both partners.
Know more about coevolution here:
https://brainly.com/question/1489642
#SPJ11
in the picture below, what is encircled? a pair of homologous chromosomes, two sister chromatids
What is encircled in the picture attached below is a sister chromatid.
What is a sister chromatid?What is found encircled in the image is a sister chromatid. It refers to the two identical copies of a chromosome that are produced by DNA replication. Each sister chromatid contains the same genetic information, and they are joined together at a region called the centromere. During cell division, the sister chromatids separate and move to opposite poles of the cell, forming two daughter cells that are identical to the parent cell.
The image shows a karyotype which is a visual representation of the chromosomes of an organism. It is obtained by staining and photographing the chromosomes, which are arranged in pairs according to their size and structure.
The complete question can be found in the attached image.
learn more about chromosomes
https://brainly.com/question/15205085
#SPJ11
the chromosome pairs line up in the center of the cell is called (A) prophase (b)mitosis (c)meiosis l (D)meiosis ll
The chromosome pairs lining up in the center of the cell is called metaphase.
Metaphase is a stage in both mitosis and meiosis where the chromosomes align at the equator or metaphase plate of the cell. During metaphase, the spindle fibers attach to the kinetochores of the chromosomes and pull them towards opposite poles of the cell in preparation for separation in the subsequent stage of the cell division process.
What is chromosome pairs?
Chromosome pairs refer to two chromosomes that carry the same genes arranged in the same sequence. In most cells of the human body, there are 23 pairs of chromosomes, for a total of 46 chromosomes. One chromosome in each pair is inherited from the mother and the other from the father.
What is mitosis and meiosis?
Mitosis is a type of cell division that produces two identical daughter cells with the same number and type of chromosomes as the parent cell. It is important for growth, development, and repair of tissues in multicellular organisms, and for asexual reproduction in some unicellular organisms.
Meiosis is a type of cell division that produces four daughter cells, each with half the number of chromosomes as the parent cell. Meiosis involves two rounds of cell division and is important for sexual reproduction in eukaryotes.
To know more about metaphase, visit:
https://brainly.com/question/16992029
#SPJ1
What is the difference between the atp used for energy and the atp used as building blocks for dna
ATP can only hold the base adenine for its nitrogenous base, whereas a DNA nucleotide can have four distinct bases. The "triphosphate" in ATP tells that ATP still has three phosphate groups, whereas DNA only has one.
It's a piece of the equivalent nucleic corrosive gathering, all living things use ATP here and there or another, and it's made of comparative structure blocks tracked down in DNA and RNA — ATP is a structure block for RNA — however its motivation serves different capabilities outside the core.
Carbon, nitrogen, hydrogen, oxygen, and phosphorus are the ATP building blocks. ATP is readily hydrolyzed in reactions to release a significant amount of energy due to the presence of unstable, high-energy bonds.
To learn more about DNA nucleotides here
https://brainly.com/question/30299889
#SPJ4
which of the following organs is not in the abdominopelvic cavity? small intestine stomach lung live
The organ which is not in the abdominopelvic cavity is the lung.
The human body can be classified into two major categories: axial and appendicular.
The axial category contains the skull, vertebral column, and thoracic cage, which encloses and protects the organs of the thoracic cavity (heart and lungs) and the superior portion of the abdominal cavity (liver, stomach, and spleen).
The abdominal cavity contains the digestive system, liver, pancreas, spleen, kidneys, and other organs, while the pelvic cavity contains the bladder, rectum, and reproductive organs.
The abdominopelvic cavity contains a vast number of organs. The pelvic and abdominal cavities have only one organ in common, which is the rectum. The other organs in the abdominal cavity include the liver, stomach, spleen, pancreas, small intestine, and parts of the large intestine. The pelvic cavity contains the bladder and reproductive organs, as well as the remaining parts of the large intestine and the rectum.
The lungs are not in the abdominopelvic cavity, however. Instead, they are housed in the thoracic cavity, along with the heart and the blood vessels that transport blood to and from the heart. The diaphragm separates the thoracic and abdominopelvic cavities, and the lungs expand and contract in response to air moving into and out of the body via the respiratory system.
Therefore, the lungs are not present in the abdominopelvic cavity, instead, they are present in the thoracic cavity.
To know more about lungs, refer here:
https://brainly.com/question/13210870#
#SPJ4
The primary source of water for a stream is ___________.
The primary source of water for a stream is rainfall. Streams are primarily formed by rainfall, which collects in lakes, rivers, and underground water sources.
The quantity of water in a stream is determined by the amount of rainfall and the water sources surrounding it.
A stream is a flowing water source that is smaller than a river and is often fed by tributaries.
Mountains, hills, and springs are the primary sources of tributaries that feed into streams.
Rainfall is crucial for maintaining the ecosystem of a stream, creating habitats for plants and animals that depend on it.
Streams are essential sources of water for people and animals living nearby.
Therefore, it is important to protect streams from contamination, pollution, or destruction to preserve the surrounding ecosystem and the lives of those living nearby.
Learn more about primary source of water.
https://brainly.com/question/30367331
#SPJ11
Diferencia entre fecundación interna y fecundación externa
Answer:
La fertilización interna, a diferencia de su contraparte, la fertilización externa, trae más control a la hembra con la reproducción.
Explanation:
which segment of the ecg reflects the plateau phase of ventricular muscle cells' action potentials? select one: a. p-t segment b. q-r segment c. s-t segment d. t-p interval e. p-r interval
The segment of the ECG that reflects the plateau phase of ventricular muscle cells' action potentials is the S-T segment. The correct option is c. During the action potential, the electrical charge of a cardiac muscle cell rapidly changes, followed by the recovery phase. The S-T segment of the ECG reflects the plateau phase of ventricular muscle cells' action potentials.
What is ECG?The electrical activity of the heart is measured and recorded using a test called an electrocardiogram (ECG or EKG). It aids in the diagnosis of cardiac rhythm issues and heart muscle damage. Electrodes (small, plastic patches) are placed on the skin of the patient's chest, arms, and legs to collect data.
Arrhythmias, heart attacks (myocardial infarctions), and other cardiac issues can be detected using ECGs. It's a non-invasive test that can provide a wealth of information about the heart.
Here you can learn more about S-T segment
https://brainly.com/question/6321902#
#SPJ11
cells of the indicated endocrine gland secrete hormones that decrease blood calcium levels? a. a b. b c. c d. d e. e
The cells of the indicated endocrine gland secrete hormones that decrease blood calcium levels as calcitonin.
In the Attachment, calcitonin is shown in figure B.
Cаlcitonin, аlso cаlled thyrocаlcitonin, is а hormone thаt plаys а role in regulаting the level of cаlcium in the blood by decreаsing it. Cаlcitonin is mаde by your thyroid glаnd, а smаll, butterfly-shаped glаnd locаted neаr the throаt.
Cаlcitonin is secreted by the pаrаfolliculаr cells of the thyroid glаnd. This hormone opposes the аction of the pаrаthyroid glаnds by reducing the cаlcium level in the blood. If blood cаlcium becomes too high, cаlcitonin is secreted until cаlcium ion levels decreаse to normаl.
Your question is incomplete, but most probably your figure can be seen in the Attachment
For more information about Cаlcitonin refers to the link: https://brainly.com/question/14649956
#SPJ11