Cell regeneration and growth of multicellular organisms are the functions of mitotic cell division.
The correct option is A and C.
What is the function of cell division?For the purpose of cellular development, repair, & replacement in the body, cell division is the procedure through which new cells are created. Nuclear material and cytoplasm are divided as a result of this process. Except for those that develop into fertilized eggs and sperm (gametes), all somatic (or host) cells multiply through the process of mitosis.
How does cell division occur?By chemical signals by specific proteins called cyclins, cells may communicate among themselves and control how frequently they divide. Informing cells when to begin dividing and afterwards when to start defining, such signals function as switches. The ability to develop and recover from wounds depends on the division of cells.
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The complete question is -
What are the functions of mitotic cell division?
a. cell regeneration
b. production of gametes
c. growth of multicellular organisms
d. asexual reproduction
Which is the main function of a fungus’s hyphaeA. Absorption of nutrientsB. Movement in waterC. Predator protectionD. Photosynthesis
The main function of a fungus's hyphae is the absorption of nutrients. Option A is correct.
Hyphae are the branching, thread-like structures that will make up the body of a fungus. They are responsible for the absorption of nutrients from the environment, as they grow and spread through soil, organic matter, or living organisms.
The hyphae secrete enzymes that break down organic matter and other substances, and the resulting nutrients are absorbed through the cell walls of the hyphae.
Fungi are heterotrophs, which means that they obtain their nutrients from other organisms or organic matter in their environment. Unlike plants, they do not perform photosynthesis, so they are not capable of producing their own food.
Instead, they rely on the absorption of nutrients through their hyphae to obtain the energy and nutrients they need to survive and grow.
Hence, A. Absorption of nutrients is the correct option.
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suppose that rabbits are the only prey and food supply of foxes, and that the predator-prey interaction follows lotka-volterra dynamics. the mortality rate of foxes in the absence of rabbits is 0.1 per week, and the intrinsic growth rate of rabbits in the absence of predation is 0.2 per week. the capture efficiency is 0.002, and the efficiency at which rabbit biomass is converted into fox biomass is 0.2. if there are initially 30 foxes and 400 rabbits, the net growth rate in the fox population will be a of
The net growth rate in the fox population is 17.9 per week.
Given:
The mortality rate of foxes in the absence of rabbits is 0.1 per week
The intrinsic growth rate of rabbits in the absence of predation is 0.2 per week.
The capture efficiency is 0.002
The efficiency at which rabbit biomass is converted into fox biomass is 0.2.
There are initially 30 foxes and 400 rabbits.
Solution:
Net growth rate in the fox population = Fox population growth rate - Fox population death rate
Fox population death rate = Mortality rate of foxes in the absence of rabbits = 0.1 per week
Now we need to calculate the fox population growth rate.
Using Lotka-Volterra dynamics, we can write the differential equation for the fox population as:
dF/dt = aFR - mF
where,
dF/dt is the rate of change of the fox population
F is the fox population, R is the rabbit population
a is the capture efficiency
m is the efficiency at which rabbit biomass is converted into fox biomass
dF/dt = aFR - mF= (0.002) (400) (30) - (0.2) (30)= 24 - 6= 18 per week
Therefore, the net growth rate in the fox population = 18 - 0.1= 17.9 per week.
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in one form of intersex, called congenital adrenal hyperplasia (cah), an xx fetus has adrenal glands that secrete excess androgens, causing the external genitalia to become partially masculinized. which other situation might result in the same abnormalit y?
The other situation of congenital that might result in the same abnormality is caused by a deficiency of 5α-reductase or androgen insensitivity syndrome.
What is congenital adrenal hyperplasia (CAH)?Congenital adrenal hyperplasia (CAH) is a group of inherited genetic disorders characterized by a deficiency in one of the enzymes required to produce steroid hormones by adrenal glands. The majority of CAH cases are inherited in an autosomal recessive manner, the individual must inherit two mutated copies of the causative gene from each parent.
What causes CAH?CAH is caused by a genetic defect in one of the enzymes involved in the synthesis of cortisol and aldosterone by the adrenal glands. The most prevalent type of CAH is caused by a 21-hydroxylase deficiency, which accounts for 95% of all cases of CAH.
What is the cause of external genitalia to become partially masculinized?In the case of congenital adrenal hyperplasia (CAH), an XX fetus has adrenal glands that secrete excess androgens, causing the external genitalia to become partially masculinized. The other situation that might result in the same abnormality is caused by a deficiency of 5α-reductase or androgen insensitivity syndrome.
The deficiency of 5α-reductase results in the underproduction of the hormone dihydrotestosterone (DHT), which is responsible for the development of male external genitalia.
In the case of androgen insensitivity syndrome, although the individual has XY chromosomes, their body cannot react to the effects of testosterone, which leads to female external genitalia.
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a silent mutation would cause: group of answer choices a change in the conformation of a protein the inhibition of translation no change in the amino acid sequence of a protein the inhibition of transcription
A silent mutation would cause (c) no change in the amino acid sequence of a protein.
A silent mutation, as the name implies, is a mutation that does not result in any modifications to the amino acid sequence of a protein.
These types of mutations arise as a result of modifications in the DNA sequence that do not lead in any changes to the amino acid sequence since the altered codon still encodes the same amino acid.
As a result, silent mutations do not have any effect on the resulting protein.
The possible options and their explanations are:
a) a change in the conformation of a protein: A change in the conformation of a protein may be caused by a change in the amino acid sequence of a protein.
b) the inhibition of translation: If the process of translation is inhibited, the synthesis of proteins will be stopped. It is not caused by silent mutations.
c) no change in the amino acid sequence of a protein: As already explained, silent mutations lead to no change in the amino acid sequence of a protein.
d) the inhibition of transcription: If the process of transcription is inhibited, RNA will not be synthesized. It is not caused by silent mutations.
A silent mutation would cause no change in the amino acid sequence of a protein. Therefore, the correct option is C.
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Which of the following is the transcription product of the DNA sequence 5ʹ-TGCCA-3ʹ?
A) 3ʹ-ACGGT-5ʹ
B) 5ʹ-UCGGT-3ʹ
C) 3ʹ-ACGGU-5ʹ
D) 5ʹ-ACGGT-3ʹ
The transcription product of the DNA sequence 5ʹ-TGCCA-3ʹ is D. 5ʹ-ACGGU-3ʹ.
Transcription is the process of transforming DNA into RNA. It is a process in which the genetic code for making proteins is transferred from DNA to RNA. DNA is used as a template for RNA synthesis in transcription. Transcription is the first stage in gene expression in which DNA sequence information is used to construct RNA chains. TGCCA is a DNA sequence that contains five nucleotides. RNA transcription is used to make an RNA strand that is complementary to the DNA strand. The sequence of nucleotides in RNA is determined by the sequence of nucleotides in DNA.
The transcribed RNA strand would have the sequence 5ʹ-ACGGU-3ʹ, which is the complement of the DNA sequence 5ʹ-TGCCA-3ʹ. During transcription, RNA polymerase binds to the promoter and begins unwinding the double helix of the DNA molecule. The template DNA strand is used by RNA polymerase to synthesize RNA in the 5ʹ to 3ʹ direction. The RNA sequence will be complementary to the DNA template strand. The resulting RNA strand, after transcription, is 5ʹ-ACGGU-3ʹ which is the transcription product of the DNA sequence 5ʹ-TGCCA-3ʹ. Therefore, the correct option is D.
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an area of dead tissue produced by a stroke is called an , and the surrounding damaged tissue is called the . group of answer choices embolism; thomboli intern; prenumbra infarct; prenumbra infarct; preamble
An area of dead tissue produced by a stroke is called an infarct, and the surrounding damaged tissue is called the penumbra.
A stroke is a cerebrovascular disease that occurs when blood flow to the brain is disrupted. Brain cells can be damaged or die as a result of a lack of oxygen and nutrients. Strokes can be caused by a variety of factors, including blood clots, aneurysms, and high blood pressure.
An infarct is a part of the body, such as an organ or tissue, that has been deprived of blood flow and oxygen, resulting in cell death. A cerebral infarct, also known as a stroke, is a type of infarct that occurs in the brain. An ischemic stroke, which is caused by a blood clot that blocks a blood vessel in the brain, is the most common form of cerebral infarct.
The penumbra is a term used to describe the area of the brain that is damaged but not completely dead after a stroke. This is the area of the brain that surrounds the infarct and is made up of brain tissue that has been deprived of oxygen and blood flow.
The penumbra is important because it may be possible to save this tissue if blood flow to the brain can be restored in time. The penumbra is typically larger than the infarct itself, and it is the area where the majority of the damage from a stroke occurs.
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g an experiment set up has two chambers that share a selectively permeable membrane. however, the water in the two chambers have unequal concentrations of solutes. if the solutes cannot move across the membrane, what transport process can be used to achieve equilibrium (i.e. when the solute concentration will be similar)?
Water molecules can move across the selectively permeable membrane through the process of osmosis.
Osmosis is the movement of the water molecules from an area of higher concentration to an area of the lower concentration, across a semi-permeable membrane.
In this case, the water molecules will move from the chamber having the lower solute concentration to the chamber with higher solute concentration until the concentration of solute will becomes equal on both sides. This will continue until equilibrium is reached, at which point the concentration of solutes will be the same on both sides of the membrane.
It's important to note that osmosis only affects the movement of water molecules and not the solutes themselves, which remain on their respective sides of the membrane.
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Part A Drag the labels to their appropriate locations on the figure. Labels of Group 2 represent processes, and labels of Group 1 represent inputs, outputs, and organelles. Reset Help Energy enters as sunlight b Chloroplast C Photosynthesis Energy exits as heat d Carbon dioxide Group 1 Cellular (CO2) respiration H- C Mitochondrion 1 g Group 2 Group 1 Glucose (CH1206) ATP drives cellular work Group 2 Submit Request Answer
Organelles, inputs, and outputs: Solar energy is introduced: Chloroplast: Energy leaves photosynthesis as heat. a carbon dioxide respiration in cells Sugar (C6H12O6): ATP powers cellular activity.
What makes photosynthesis so special?Some of this chemical energy is stored during the photosynthesis process, which turns carbon dioxide and water into sugars and starches.
What is the name of this process?Photosynthesis is the process through which plants turn carbon dioxide, water, and sunlight into oxygen and sugar-based energy. Water and carbon dioxide are converted into oxygen and glucose during photosynthesis. The plant consumes glucose and produces oxygen as a result.
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Researchers have undertaken a long-term study of populations of rock pocket mice, Chaetodipus intermedius, in Arizona and New Mexico. Rock pocket mouse fur is either dark or light in color. Most of the populations studied live in areas with light-colored granite rocks; however, some areas are dominated by dark-colored rocks from ancient lava flows. Researchers collected mice from six sites in Arizona and recorded their coat colors. Figure 1 shows the study sites, the rock colors, and the distribution of coat colors. In the Arizona populations, the melanocortin-1 receptor (MC1R) gene is responsible for coat color phenotype (light or dark). The MC1RD allele, which results in a dark coat, is dominant to the d allele. Researchers collected samples of mice from all six study sites and sequenced the MC1R gene. They also collected mice with dark coats from a location in New Mexico, the Carrizozo lava flow, to determine if the MC1Rgene was also responsible for the dark coat colors observed in that population. The rock pocket mouse population in Carrizozo is isolated from the populations in Arizona. Table 1 presents the genotypic data from sampled mice from all seven locations. Which of the following best describes the processes occurring between the mouse populations and their environments?
The processes occurring between the mouse populations and their environments is natural selection.
The color of the mouse's fur coats is determined by the melanocortin-1 receptor (MC1R) gene, and the MC1RD allele is dominant to the d allele.
The mice living in the areas with light-colored granite rocks are more likely to have a light coat due to natural selection, while those living in areas with dark-colored rocks from ancient lava flows have a higher chance of having a dark coat.
The table of genotypic data from the mice in the seven locations provides evidence of this phenomenon.
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assume that genes a and b are linked and are 50 map units apart. an animal heterozygous at both loci is crossed with one that is homozygous recessive at both loci. what percentage of the offspring will show phenotypes resulting from crossovers? if you did not know that genes a and b were linked, how would you interpret the results of this cross?
Assuming that genes A and B are linked and 50 map units apart, and that you cross an animal that is heterozygous at both loci with one that is homozygous recessive at both loci, then 50% of the offspring will show phenotypes resulting from crossovers. If you didn't know that genes A and B were linked, you would interpret the results of this cross as showing that the two loci are linked and 50 map units apart. This is because, without linkage, the probability of having offspring that are heterozygous at both loci would be much lower.
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Which one of the following has the highest heating value per pound? A) Coal B) Oil C) Natural gas. C) Natural gas.
Answer:
C) Natural gas
a man has a condition in which his sperm cannot produce the energy to move independently. this suggests the presence of a defect in which part of the sperm?
The given scenario suggests the presence of a defect in the flagella part of the sperm. The flagellum is an appendage found in many types of cells, including the sperm cell.
The primary function of the flagellum is to provide the cell with the ability to move. So, the flagella in sperm helps them swim towards the egg and thus reach the destination where fertilization takes place.The condition of the man in which his sperm cannot produce the energy to move independently suggests that the flagellum part of the sperm has a defect. The flagella are made up of microtubules that are arranged in a distinct pattern in order to give the sperm the ability to swim forward.
Flagella contain protein fibers known as microtubules, which play an important role in providing support to the cell as it moves. A dynein arm and ATP drive the movement of the flagellum by sliding the microtubules against one another. This sliding action results in the sperm's swimming motion. Hence, it is concluded that the presence of a defect in the flagella part of the sperm may lead to the condition of not producing energy to move independently.
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deciduous teeth in which bone has fused to cementum and dentin, preventing exfoliation of the deciduous tooth and eruption of the underlying permanent tooth are termed
Deciduous teeth in which bone has fused to cementum and dentin, preventing exfoliation of deciduous tooth and eruption of the underlying permanent tooth are called as ankylosed deciduous teeth.
Ankylosis is the fusion of cementum, the outer layer of the tooth root, to the bone that surrounds it. In the case of deciduous teeth, ankylosis can occur when there is a delay in the eruption of the underlying permanent tooth, and the roots of the deciduous tooth continue to grow and fuse with the bone.
When ankylosis occurs in deciduous teeth, it can prevent the normal exfoliation (shedding) of the deciduous tooth and eruption of the permanent tooth. This can cause problems with tooth alignment and lead to complications such as malocclusion and orthodontic issues.
Treatment for ankylosed deciduous teeth may involve removal of the ankylosed tooth and orthodontic intervention to help guide the eruption of the permanent tooth into the correct position.
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the only structure that attach directly to the lungs is ?
a. trachea.
b. bronchi.
c. bronchioles.
d. terminal bronchioles.
The correct answer is d. terminal bronchioles.
Terminal bronchioles are the smallest air passages in the lungs and are responsible for delivering air directly to the respiratory bronchioles, where gas exchange occurs. The trachea, bronchi, and bronchioles are all part of the airway system that leads to the lungs but they do not directly attach to the lungs.
How are stripes in tigers a beneficial adaptation? Explain how tiger stripes could have evolved through gradualism.
Tiger stripes are a beneficial adaptation for Firstly, the stripes provide camouflage, which helps tigers blend in with their environment and avoid detection by prey and predators. Secondly, the stripes may disrupt the tiger's outline, making it more difficult for prey to discern the shape of the tiger and enabling the tiger to get closer to prey before attacking.
The evolution of tiger stripes could have occurred through gradualism, which is the idea that evolution occurs through the accumulation of small, incremental changes over time. It is believed that the ancestral form of tigers may have had a coat color that was more uniform and lacked stripes.
These individuals would be more likely to survive and reproduce, passing on their stripe pattern to their offspring. Gradually, the stripe pattern would become more prominent in the population over time, eventually leading to the fully developed tiger stripe pattern we see today.
Therefore, the gradual accumulation of small changes through natural selection is likely to have been the primary driving force behind the evolution of this beneficial adaptation.
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mayfly, stonefly, and caddisfly larvae are macro-invertebrates that are often used as indicator species in water quality testing. what do you think these species tell us about the water quality in lakes, streams or rivers?
Mayfly, stonefly, and caddisfly larvae are commonly used as indicator species in water quality testing because they are sensitive to changes in their environment and have different tolerance levels to various pollutants, making them valuable indicators of water quality.
These larvae require clean, oxygen-rich water to survive, so their presence in a body of water is a good indication that the water quality is healthy. Conversely, the absence or low numbers of these macro-invertebrates suggest poor water quality.
In addition, the different species of mayflies, stoneflies, and caddisflies have varying sensitivities to different types of pollutants. For example, some species may be more tolerant of sedimentation, while others may be more sensitive to changes in pH levels or high levels of nutrients.
These insects, which have a life cycle that begins in water and ends on land, are critical indicators of water quality, especially in rivers and streams. They play a key role in the food chain, providing nourishment for fish, birds, and other aquatic animals.
Therefore, by examining the abundance and diversity of these indicator species, scientists can gain insight into the types and levels of pollutants present in the water. This information can then be used to make informed decisions about water management, conservation, and restoration efforts.
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Fill The Blank? the process that pushes food through the esophagus is called ________
The process that pushes food through the esophagus is called peristalsis. So the suitable term to fill in the blank is peristalsis.
Peristalsis is a muscular process that aids in the transport of food through the digestive system. Peristalsis is a sequence of involuntary muscle contractions that transports food in a single direction along the digestive tract. When the esophagus muscles move in this manner, the peristaltic wave transports food from the pharynx to the stomach. Food is propelled down the digestive tract by rhythmic muscular contractions, beginning in the mouth and continuing until the waste material is excreted from the body through the rectum and anus.
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Arthritis is the inflammation of a joint. Arthritis always involves damage to the articular cartilage, but the specific cause can vary. Please discuss the different types of arthritis and the causes and treatment options for each, including osteoarthritis, gouty arthritis, and rheumatoid arthritis
The most common types of arthritis are osteoarthritis, gouty arthritis, and rheumatoid arthritis. Osteoarthritis is caused by wear and tear of the joint, gouty arthritis is caused by uric acid buildup. Treatment options include medication, physical therapy, lifestyle changes.
Arthritis is a common condition that can cause pain and stiffness in the joints. The most common types of arthritis are osteoarthritis, gouty arthritis, and rheumatoid arthritis. Osteoarthritis is caused by the wear and tear of the joint over time.
Gouty arthritis is caused by the buildup of uric acid crystals in the joint. This can be due to a diet high in purines, genetics, or other medical conditions. Treatment options for gouty arthritis include medication to reduce inflammation and pain, lifestyle changes such as dietary changes, and medication to lower uric acid levels.
Rheumatoid arthritis is an autoimmune disorder in which the body's immune system attacks the joints, causing inflammation and damage to the articular cartilage. Treatment options for rheumatoid arthritis include medication to reduce inflammation and slow the progression of the disease, physical therapy, and lifestyle changes.
In severe cases of arthritis, surgery may be required to repair or replace damaged joints. In general, early diagnosis and treatment are important for managing the symptoms of arthritis and preventing further damage to the joints.
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explain how predation contributes to changes in coloration (aposematic and cryptic) and the evolution of mimicry (batesian and mullerian).
Predation is the action of preying on something or someone. Predation leads to changes in coloration in many ways, including the evolution of mimicry (Batesian and Mullerian) and aposematic and cryptic coloration.
Batesian mimicry is a form of mimicry where a harmless organism mimics a harmful organism to deter predators. In contrast, Mullerian mimicry is a form of mimicry where two or more harmful organisms appear alike. Therefore, predation can lead to changes in coloration, which aids in the evolution of mimicry (Batesian and Mullerian).
Predation also leads to changes in coloration through aposematic and cryptic coloration. Aposematic coloration is where animals have bright colors to warn predators that they are toxic or venomous. Cryptic coloration is where animals have dull colors, making them hard to spot by predators.
In conclusion, predation contributes to changes in coloration in many ways, including the evolution of mimicry (Batesian and Mullerian) and aposematic and cryptic coloration. Therefore, animals have developed different mechanisms to adapt to the environment and survive, depending on the threats they face.
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Relatively constant internal physical & chemical conditions that organisms maintain is called
The relatively constant internal physical and chemical conditions that organisms maintain are called "homeostasis".
Homeostasis refers to the ability of an organism to maintain a stable internal environment despite external changes. It is a fundamental concept in biology and is essential for the proper functioning of living organisms. The term was first coined by Walter Cannon in 1926.
Homeostasis is achieved through the coordinated action of various physiological mechanisms that work together to regulate and maintain the internal environment within narrow limits. These mechanisms include temperature regulation, pH balance, osmoregulation, and glucose regulation, among others. For example, the body maintains a constant body temperature of around 37°C through mechanisms such as sweating, shivering, and blood vessel dilation or constriction.
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you discover a new animal, but do not know whether it is a carnivore or a herbivore. carbon to nitrogen ratio analysis of it's poop reveals a high c:n ratio. what can you conclude about its feeding habits
Answer:
You can conclude that the c:n ratio gives the most proof that the animal is an omnivore
For all of the following questions, a grumpy prince is crossed with a homozygous happy, heterozygous dwarf.
A= happy a= grumpy, B= dwarf b= prince
What is the genotype of the dwarf?
The tall plant's genotype is Tt because there are exactly one tall plant for every one dwarf plant in the offspring.
What else is meant by homozygous?In terms of genetics, being homozygous means that you have inherited the identical alleles of a particular genomic marker from both of your biological parents. As a result, a person who possesses two identical copies of a genetic marker is said to be homozygous.
Dominant or recessive is homozygous?When an organism is homozygous, it signifies that it possesses two copies of the same gene allele. If an organism possesses 2 copies of the identical dominant allele, it is said to be homozygous dominant, and if it possesses two copies of the same recessive gene, it is said to be homozygous recessive.
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if the dorsal root ganglia from a given spinal segment were removed, sensory information from the associated parts of the body could not be conveyed to the cns.
True False
The assertion is true. The dorsal root ganglia are clusters of sensory neuron cell bodies found outside the spinal cord, near the spinal nerve roots.
Sensory neurons in the dorsal root ganglia have axons that extend into the periphery to pick up sensory information from the skin, muscles, and other tissues and transmit it to the spinal cord and higher brain centers.
The dorsal root ganglia are critical for transmitting sensory information to the CNS, and if they were removed, sensory information from the associated areas of the body would be lost.
Sensory information goes through the dorsal root ganglia, which contains the cell bodies of sensory neurons, and then through the dorsal roots of the spinal cord, where it enters the spinal cord.
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Heart rate will increase in the presence of increased. A) low-density lipoproteins. B) immunoglobulins. C) erythropoietin. D) epinephrine. E) platelets
Heart rate will increase in the presence of increased D) epinephrine. Epinephrine, also known as adrenaline, is a hormone produced by the adrenal glands in response to stress or danger.
It acts on the heart by increasing the rate and force of contractions, which can raise heart rate and blood pressure, and provide more oxygen and nutrients to the body's muscles and organs in preparation for a "fight or flight" response. Low-density lipoproteins, immunoglobulins, erythropoietin, and platelets are not directly involved in regulating heart rate.
When epinephrine binds to beta-adrenergic receptors on the heart, it stimulates the production of cyclic AMP (cAMP), which activates protein kinase A (PKA). PKA then phosphorylates various proteins involved in the contraction and relaxation of cardiac muscle cells, including calcium channels, myosin light chain kinase, and troponin I, among others. This results in an increased heart rate, the increased force of contraction, and increased cardiac output, which helps to meet the increased metabolic demands of the body during times of stress or exercise.
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a human ______ cell has 46 chromosomes, 23 chromosomes from each parent.
A human diploid cell has 46 chromosomes, 23 chromosomes from each parent.
explain how their bodies would have responded to the decrease in body temperature by
It has been discovered that the body contains an internal thermostat that functions quite similarly to the thermostat you could have in your home.
RegulationMessages about body temperature are sent to the hypothalamus from every part of the body. The heating center, a part of the hypothalamus, is activated if the hypothalamus begins to receive excessive signals from the body that it is chilly. We experience cold when the heating center is engaged, and we act in order to stay warm by putting on more clothing, looking for a heat source, or finding refuge. In order to prevent heat loss, the heating center also increases our body hair, constricts the blood vessels at the skin's surface, and can cause shaking, which causes tiny, nearby blood vessels to constrict and produce heat.For more information on body temperature kindly visit to
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At a source, sucrose moves into the phloem in the apoplastic pathway by
a. Tension within sieve tubes produced by sucrose unloading at sink cells
b. osmosis
c.secondary active transport into companion cells (using the proton gradient and symport of the sugar)
d. strictly symplastic movement from adjacent mesophyll cells
e. A and D
Sucrose moves into the phloem in the apoplastic pathway by secondary active transport into companion cells (using the proton gradient and symport of the sugar), option D.
Phloem is plant vascular tissue that transports foods produced in the leaves during photosynthesis to the rest of the plant. Phloem is made of numerous specialised cells called sieve elements, phloem fibres, and phloem parenchyma cells.
In addition to xylem (tissue that transports water and nutrients from the roots to the rest of the plant), phloem is found in all vascular plants, including seedless club mosses, ferns, and horsetails, as well as all angiosperms (flowering plants) and gymnosperms (seedless plants) (plants with seeds unenclosed in an ovary).
Apoplastic water transport beyond the cortex is inhibited by the Casparian strip of endodermal cells. Thus, the symplastic pathway is exploited to transfer water and ions beyond the cortex.
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which substance usually passes in the greatest amount through the placenta from the blood of the fetus to the blood of the mother?
Oxygen usually passes in the greatest amount through the placenta from the blood of the fetus to the blood of the mother.
The placenta works as a barrier between the mother's and the baby's circulatory systems. This lets different substances move back and forth. Oxygen is very important for the growing foetus because it helps cells breathe and grow.
Through the placenta, oxygen moves from the mother's blood into the blood of the foetus. This makes sure that the foetus gets enough oxygen as it grows. Other things, like nutrients and waste, also pass through the placenta, but oxygen is usually the most important material in terms of how much of it is there.
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4) in terms of a bad smell, why is it better to stay in its presence than to leave and return several times? group of answer choices olfactory receptors are rapidly adapting. olfactory receptors are tonic. slowly adapting receptors take longer to come online. with time, labeled lines change their modality. the decrease in graded potentials increases the frequency of their action potentials.
In terms of a bad smell, it is better to leave its presence rather than to stay in its presence or leave and return several times. This is because olfactory receptors are rapidly adapting, which means that they quickly become desensitized to a constant odor.
When we are exposed to a smell for an extended period of time, our olfactory receptors stop responding as strongly to the odor, and we become less aware of it. This is called olfactory adaptation or sensory adaptation. However, if we leave the area and return later, the odor will seem strong again because our olfactory receptors have had time to recover and become sensitive to the odor once again.
Hence, it is better to leave the area and let our olfactory receptors recover before returning, rather than staying in the presence of the bad smell or leaving and returning several times.
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in a chloroplast, a stack of flattened thylakoid sacs is called a
In a chloroplast, a stack of flattened thylakoid sacs is called a granum. A chloroplast is an organelle found in the cells of all green plants and some photosynthetic organisms like algae.
Chloroplasts conduct photosynthesis, where the chlorophyll pigments capture energy from sunlight and convert it into usable chemical energy. Chloroplasts are oval or disc-shaped organelles that range in size from 5 to 10 µm long and 2 to 4 µm wide.
A granum is a stack of flattened thylakoid sacs in a chloroplast. A thylakoid is a membranous sac inside a chloroplast that contains the light-harvesting pigments and reaction centers for the photosystems, as well as transporters and enzymes for electron transfer and ATP synthesis. Chloroplasts contain thylakoids that are arranged in stacks called grana or granules.
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