Answer:
The options are
A) nonrandom selection.
B) disruptive selection.
C) directional selection.
D) stabilizing selection.
The answer is C)directional selection.
Explanation:
Directional selection is a type of natural selection and occurrence in population genetics. It involves a phenotype which is most extreme being chosen over forms of phenotypes. It occurs over a period of time when the allele frequency completely aligns in the pattern of the extreme phenotype.
This explains why the frequency of a previously rare allele becomes more frequent in the population after a certain period of time.
What do neurotransmitters do? A. Cause the pre-synaptic neuron to open voltage-gated gates. B. Diffuse across the synaptic cleft and bind to specific receptor sites on the post-synaptic cell. C. Cause calcium to diffuse across the synaptic cleft and bind to specific receptor sites on the post-synaptic cell. D. Diffuse synaptic vesicles which releases molecules into the synaptic cleft.
Answer:
D. Diffuse synaptic vesicles which releases molecules into the synaptic cleft.
Explanation:
Hope it helps.
Answer:
B.
Explanation:
Diffuse across the synaptic cleft and bind to specific receptor sites on the post-synaptic cell.
Which of the following evidence must be stored in an airtight container? Bullet Casings, Gun Magazines, Hair, Wet Fluids, Tire Track Casts
Answer:
gun magazines
Explanation:
the others don't make sense.
Instructions on how to control your cells are contained in what part of the DNA?
Answer:
Genes
Explanation:
The genes are specific fragments of the DNA molecule that contain the information necessary to synthesize different types of RNAs, including messenger RNAs (mRNAs) which are subsequently translated into proteins required for different cellular functions including replication, cell cycle, proliferation, apoptosis, etc. Genes are first transcribed to RNA during transcription. In eukaryotic organisms, the genes contain both exonic and intronic sequences that are jointly transcribed into the primary mRNA, and then the introns are removed during RNA splicing. The genes have a specific initiation signal sequence known as start codon (AUG) and termination codons (UGA, UAA, UAG) that terminates the translation of the mRNA.
Distinguish between pulmonary circulatory system and systemic circulatory system
Answer:
Pulmonary circulation only occurs between the heart and the lungs. Systemic circulation refers to the circulation of blood in which oxygenated blood is pumped from the heart to the body and deoxygenated blood is returned back to the heart. Systemic circulation occurs between the heart and the entire body.
Explanation:
Answer:
Pulmonary ciculatory system transports poor-oxygen blood from the heart to the capillaries in the lungs. The lungs transport the rich-oxygen blood to the heart.
Systemic circulatory system transports rich-oxygen blood from the heart to the capillaries in the body. The capillaries in the body transports the poor-oxygen blood back to the heart.
Which is one common property of inorganic substances? They are solid at room temperature. They are poor conductors of electricity. They contain carbon. They burn readily.
Answer:
They are solid at room temperature.
Explanation:
Inorganic substances are substances that does not have carbon and hydrogen. Most inorganic compounds are metals or alkali metals which make them to be able to conduct electricity.
They are solid at room temperature which make them to be poor conductor of electricity at solid state. In the solid state, the individual particles of a substance are in fixed positions to each other because there is not enough thermal energy to be able to overcome the intermolecular interactions between the particles.
Why do you think the eukaryotic DNA requires multiple origins of replication?
A.
Multiple origins help make more copies of the same DNA simultaneously.
B.
Eukaryotic organisms have unique DNA strands for each specialized cell.
C.
Eukaryotes do not have topoisomerase, so multiple origins are created due to tension from unwinding of DNA strands.
D.
Eukaryotic DNA is much larger and replication at multiple origins helps reduce the time required for whole genomes to replicate.
E.
Multiple origins of replication ensure that there are no lagging strands and replication takes place at the same pace.
.
Answer:
D.
Explanation:
Prokaryotic DNA exhibit single origin of replication while eukaryotic DNA has multiple origins of replication because eukaryotic DNA is much larger and multiple origin of replicate helps them to replicate the whole genome in short time duration.
Large DNA of eukaryotes contain high amount of material to be replicated and multiple origin sites helps them to replicate in short time. DNA replication initiate at each origin site independentaly and terminate at corresponding termination sites.
Hence, the correct answer is D.
Answer:
D
Explanation:
i took the test
A maternal condition defined by the progressive dilation and effacement of the cervix that begins after 20 weeks and before term (the 37th week of pregnancy). This condition occurs because risk factors that are known or unknown cause uterine contractions and the cervix to dilate and efface prior to the time that the fetus is considered Term or 37-41 weeks. Many known and unknown causes for the condition exist. This condition is the leading cause of morbidity and mortality of newborns.
Answer:
preeclampsia
Explanation:
Answer:
preeclampsia
Explanation:
Human-induced environmental changes can affect living things at which level(s)?
Answer:Water hyacinths from Asia now grow in the United States and are crowding out animals and other plants.
Explanation: that ur asnswer
Answer:
The answer is D) organisms, populations, and species
Explanation:
Which statement best describes how Watson and Crick's model used other scientists' work to create a model of DNA? They used Chargaff's rule to determine that it contains ribose sugar. They used Franklin's photo to determine that DNA was a double helix. They used Levene's work to determine the number of base pairs in each strand. They used Nirenberg and Matthei's studies to determine that DNA is made of nucleotide
Answer:
The correct statement is-
They used Chargaff's rule to determine that it contains ribose sugar.
They used Franklin's photo to determine that DNA was a double helix.
Explanation:
Watson and Crick used pieces of information available from different researchers such as Chargaff's rules and Franklin.
Chargaff had explained that of the four kinds of nucleotides are present in a DNA molecule in such a manner that 2 types of nucleotides were always present in the same amounts and the other 2 types of nucleotides were also always present in same amounts.
The first X-ray picture of DNA, created by Rosalind Franklin using a technique known as X-ray crystallography, which led to Watson and Crick's model of DNA. It explained the helical shape of the DNA molecule.
The correct statement is-
They used Chargaff's rule to determine that it contains ribose sugar.
They used Franklin's photo to determine that DNA was a double helix.
Answer:
They used Franklin's photo to determine that DNA was a double helix.
Explanation:
The chromosome undergoes a transloation mutation during its replication. Which image best represents the translocation
Which statement is not true about prokaryotic cells? They are always single-celled organisms, and they never contain mitochondria. They have a circular loop of DNA instead of multiple linear DNA molecules. They lack a nucleus, but they do have ribosomes. They may have flagella, but they never have cilia. They all have a rigid cell wall instead of a plasma membrane.
Answer:
They lack a nucleus, but they do have ribosomes.
Explanation:
Prokaryotes are unicellular organisms that lack organelles or other internal membrane-bound structures. Therefore, they do not have a nucleus, but, instead, generally have a single chromosome: a piece of circular, double-stranded DNA located in an area of the cell called the nucleoid.
Which of the following statements describes a planet but not a dwarf planet? Select one: a. It is not a moon of a larger planet. b. It orbits around a star. c. It has cleared its orbit of smaller objects. d. It has enough mass to form a spherical shape. Clear my choice
Answer:
C
Explanation:
It has cleared its orbit of smaller objects is the statements describes a planet but not a dwarf planet.
What is a plant?A planet is a celestial body that is in orbit around the Sun, has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and has cleared the neighbourhood around its orbit.As their name suggests, the main difference between a dwarf planet and a planet is size. Because they are smaller, dwarf planets lack the gravitational forces needed to pull in and accumulate all of the material found in their orbits. Each known dwarf planet in our solar system is actually smaller than Earth's Moon.It has cleared its orbit of smaller objects is the statements describes a planet but not a dwarf planet.
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The single most important feature to consider when purchasing a scuba regulator is: How well it performs in controlled laboratory testing. A second-stage adjustment knob to ensure ease of breathing. The availability of regular, professional maintenance. Both the first and second answers are correct.
Answer:
A diving regulator is a pressure regulator that reduces the pressure of gas in the tank and deliver it to the diver so that he/she can breathe easily. It must pass the controlled laboratory testing and must have a second adjustment knob to ensure ease of breathing. Modern regulators are precision made and designed to work under demanding conditions. 1st stage and 2nd stage, diaphragm and piston, exhaust valve and purge button are types of diving regulators.
A scuba regulator is a pressure regulator that lowers the gas pressure in the cylinder and supplies it to the diver, making it easier for the diver to breathe. A second adjustment knob is needed to pass controlled laboratory tests and facilitate breathing. Modern regulators are precisely designed and designed for use in harsh conditions. The first and second stages, diaphragm and piston, exhaust valve, and flush button are a type of regulators.
What does the regulator do?The regulator is an excellent invention that provides exactly the air needed for breathing from the scuba tank. The regulator is the focus of the scuba gear and connects the scuba tank to BC, scuba pressure gauge (SPG), alternative air sources, and many other devices.
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Sanshool, a compound found in Sichuan peppers, is used in making spicy Asian food. It is known to inhibit a subset of potassium leak channels involved in maintaining the resting membrane potential. What effect do you think sanshool would have on the membrane potential
Answer:
Explanation:
In this specific scenario, the sanshool would cause the resting potential to elevate into less negative values thus making it easier to excite the neuron . In a standard scenario, the resting potential of neurons is about -70 mV and at the resting potential the concentration of ions is kept constant through Na+/K+ pumps.
What process is similar in function to genetic engineering but different in the mechanism it uses? A. Breeding for specific traits B. Cellular Respiration C. Genetic Calculus D. Replication in a bioreactor
Answer:
D. Replication in a bioreactor
Explanation:
Genetic engineering is defined as the process of gene manipulation in which a gene is altered by the introduction of new genes across species boundaries to produce an improved version of organisms.
The function of genetic engineering is to produce high quality and quantity of new organism.
Replication in a bioreactor has a similar function as genetic engineering but has a different mechanism.
Replication is a process in which DNA copy itself to form a new organism.
Replication in a bioreactor function to convert copies of DNA into high-quality product under optimal condition.
Hence, the correct option is "D. Replication in a bioreactor".
Image C: nervous tissue
Image D: muscle tissue
Part A
Based on the words connective tissue and the arrangement of cells in image B, what is this tissue's
function in the body?
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Answer:
Hello. You did not show the images, but the function of the connective tissue in the body is to provide support by filling the empty spaces between one tissue and another. In addition, it is responsible for nourishing the tissues to which it is connected.
Explanation:
Generally speaking, connective tissue is a connecting tissue. its function depends a lot on the cells that make it up, but in general, we can say that this type of tissue is responsible for promoting the support of other tissues in the body. This is because the connective tissue is able to fill empty spaces between the fabrics, in addition to being able to provide necessary nutrition to these fabrics whenever necessary.
Which statement is true about chromosomes?
Answer:
4.they are made up of DNA wrapped around proteins
What systems supply food and oxygen needed for respiration?
Answer:
I think its white blood cells or something like that sorry!
Explanation:
The respiratory and circulatory systems deliver oxygen and eliminate metabolic waste. It controls blood pH. Respiration exchanges oxygen and carbon dioxide between the atmosphere and bodily cells.
What is respiration?The passage of oxygen from the outside environment into the cells of the tissues is what is referred to as respiration in the field of physiology. At the same time, carbon dioxide is removed from the tissues and released back into the environment.
Together with the circulatory system, the respiratory system is responsible for supplying the body with oxygen and removing waste products from the metabolic process. Additionally, it helps to maintain a healthy pH level in the blood. The process by which oxygen and carbon dioxide are transported from the outside environment into the cells of the body is called respiration. During this process, oxygen and carbon dioxide are exchanged.
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If a mutation occurs in a somatic cell that leads to a non-functional protein, what will happen to that somatic cell?
A. It will prevent the cell from completing the cell cycle.
B. It will enable the cell to fix the mutation.
C. It will prevent the cell from finishing the S phase.
D. It will continue through the cell cycle as normal
If a mutation occurs in a somatic cell that leads to a non-functional protein, what will happen to that somatic cell?
A. It will prevent the cell from completing the cell cycle.
B. It will enable the cell to fix the mutation.
C. It will prevent the cell from finishing the S phase.
D. It will continue through the cell cycle as normal
What is a ‘control’ in an experiment
Answer:all the things that you keep the same in the experiment
Explanation:
Marissa is testing a hypothesis through experimentation. She believes that immersing ocean coral in carbonic acid will slow the coral’s growth. Which of these actions will prevent Marissa from introducing confounding variables into her experiment?
Answer:
The answer choices to this question are:
A) She releases cement particles into a random number of the coral samples.
B) She uses three different types of coral to establish her dependent variables.
C) She treats the coral samples identically with varying levels of carbonic acid.
D) She obtains her coral samples from coral reefs surrounding different continents.
Best Answer is:
A) She releases cement particles into a random number of the coral samples.
Theory:
It has been researched that ocean acidification caused by carbon dioxide emissions causes a decrement in the coral reef growth and this will keep slowing down unless steep and rapid reductions in greenhouse gas emissions are made. And the Coral reefs offered economic opportunities would advantage the surrounding communities from fishing and tourism.
i did this question so thats why i know the answer choices
hope this helpsss
Answer: C. She treats the coral samples identically with varying levels of carbonic acid.
Explanation: I just took the test and this is correct
The chemical equation of photosynthesis includes 602. Which best describes this substance?
a solid used during photosynthesis
O a gas used during photosynthesis
a liquid produced during photosynthesis
a gas produced during photosynthesis
Answer:
a gas produced during photosynthesis
Explanation:
during photosynthesis plants use carbon dioxide, water and sunlight to make sugar (glucose) and a waste product, oxygen gas.
the equation of this process can be:
6 CO2 + 6 H2O + light energy → C6H12O6 + 6 O2.
carbon dioxide + water + light → glucose + oxygen
Answer:
D
Explanation:
I Finsh the test
The graphic shows the citric acid cycle. A diagram of the citric acid cycle is shown. Acetyl C o A enters the citric acid cycle and combines with a 4-carbon compound to form citric acid. During the citric acid cycle, what happens to acetyl-CoA? It enters the citric acid cycle and gains carbon dioxide to form citric acid, and gains more carbon dioxide through redox reactions to form a 4-carbon molecule. It enters the citric acid cycle and associates with a 4-carbon molecule, forming citric acid, and then through redox reactions regenerates the 4-carbon molecule. It enters glycolysis and associates with a 5-carbon molecule through redox reactions, forming another acetyl-CoA molecule. It enters the citric acid cycle and associates with a 4-carbon molecule, forming a 5-carbon compound, and then through oxidation reactions regenerates the 4-carbon molecule.
Answer:
It enters the citric acid cycle and associates with a 4-carbon molecule, forming citric acid, and then through redox reactions regenerates the 4-carbon molecule.
Explanation:
Acetyl-CoA(2C) associates with oxalacetate(4C) to form citric acid(6C). Then through redox reactions, CO2 molecules result from decarboxylation (COOH becomes R-(R1)CH-R2). And through dehydrogenation H2 molecules are incorporated in NADH+ in FADH2, resulting in the 4-carbon molecule at the beginning (oxalacetate). That's why it's called a cycle(Kreb's cycle or citric acid cycle)
In the citric acid cycle, when acetyl-CoA enters the cycle, it associates with a 4-carbon molecule (Oxalacetate), forming citric acid, and then through redox reactions regenerates the 4-carbon molecule (Oxalacetate).
--------------------
The resumed steps of the Citric acid cycle are as follows,
1) Acetyl CoA joins an oxaloacetate molecule, which is a 4C molecule. They release the CoA group and form a 6C molecule called Citrate.
Acetil CoA + Oxalacetato → Citrato + CoA group
2) Citrate turns into an isomere Isocitrate
3) Isocitrate oxidates and release 1 CO₂ molecule, producing an α- ketoglutarate molecule -this is a 5C molecule-. Meanwhile, NAD+ reduces to NADH.
Isocitrate + NAD+ → α-cetoglutarate + CO₂ + NADH
4) α-ketoglutarate oxidates and release 1 CO₂ molecule, producing a 4C molecule, which joins a Coenzyme A producing Succinyl-CoA. Meanwhile, NAD+ reduces to NADH.
α-cetoglutarate + NAD+ → 4C molecule + CO₂ + NADH
4C molecule + Coenzyme A → Succinil-CoA
5) CoA from Succinyl-CoA is substituted with a phosphate group, which then forms ATP. The final product is Succinate and ATP
Succinyl-CoA + Phosphate group + ADP → Succinate + ATP + CoA
6) Succinate oxidizes and forms Fumarate, a 4C molecule. FAD+ forms FAH₂
Succinate + FAD+ → Fumarate + FADH₂
7) A water molecule and Fumarate produce Malate, which is another 4C molecule
Fumarate + H₂O → Malate
8) Finally, malate oxidizes and oxalacetate regenerates -the initial 4C compound-. NAD+ reduces to NADH.
Malato + NAD+ → Oxalacetate + NADH
So, when acetyl-CoA enters the cycle, it associates with a 4-carbon molecule (Oxalacetate), forming citric acid, and then through redox reactions regenerates the 4-carbon molecule (Oxalacetate).
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Sulfa antibiotics damage bacteria by affecting a certain bacterial enzyme. The sulfa antibiotic looks similar to a substrate normally required by the bacterial cells to live. The sulfa antibiotic occupies the active site of the required enzyme and blocks entry of its normal substrate. This prevents the bacteria from making nucleotides that are required for their reproduction and survival. Based on this information, the action of sulfa antibiotics is an example of
Answer:
non competitive inhibition
Explanation:
because the substrate and the antibiotic do not compete for active sites but rather the antibiotic inhibits the site blocking the normal substrate completely
1) Different types of parenchyma ? And their location and Function ? please please mark me brainlist
Answer:
n the different regions of the plant body parenchyma cells are involved in different functions. On this basis, following types of parenchyma can be recognised.
Chlorenchyma is the parenchyma in which the cells contain large number of chloroplasts. Chlorenchyma takes part in photosynthesis. It occurs in the leaves and other green parts of the plant body.
Prosenchyma is a type of parenchyma where cells are elongated with tapering ends.
Arenchyma is the parenchyma in which the cells enclose large intercellular spaces that are filled with air. Aerenchyma helps in buoyancy and respiration. It is characteristically found in aquatic floating plants.
Vascular parenchyma is the parenchyma, which is found associated with the vascular tissues xylem and phloem. Accordingly, it is distinguished into xylem parenchyma and phloem parenchyma.
Medullary parenchyma is the parenchyma, which is found radially arranged in between the vascular bundles in the stem. It is meant for storage of reserve food.
Conjunctive parenchyma is the parenchyma, which occurs in the root system. It is specially meant for storage of water.
Armed parenchyma is the parenchyma, which is found in the epidermis of leaves in some gymnosperms. The cells have many spiny projections. It is defensive in function.
The term describes cells in both plant and animal tissues. In plants, parenchyma cells are a distinct type of tissue that can grow and divide and they have a thin cell wall. They make up flowers, leaves, and the inner parts of roots and stems that grow and divide. These cells secrete sap, exchange gases, and conduct photo synthesis. Plant parenchyma is classified into 4 shapes: polyhedral, stellate, elongated, and lobed.
In animals, parenchymal cells are the functional cells within the organism. This does not include those that have structural and/or protective functions like bone cells that make up a skeleton. In the brain, the parenchyma consists of neurons and glial cells. In addition, the cancer cells in tumors that are not involved with blood vessels are called parenchyma.
Answer:
a. Photosynthetic parenchyma: it is commonly found under the epidermis, where light is more intense. It is specialized in photosynthesis thanks to the many chloroplasts present in the cells.
b. Storage parenchyma: They are mostly found in solution, such as lipids, proteins, and others. Their function is to synthesize and store a number of substances.
c. Aquiferous parenchyma: It is present in plants that live in dry environments, known as xerophyte plants. Their function is to store some amount of water.
Explanation:
Hope u mark as brainiest answer
Which are produced as a result of meiosis? A) zygotes B) chromosomes C) tetrads D) gametes
Answer:
D.
Explanation:
because.
Gametes are produced as a result of meiosis.
What are the different stages of meiosis ?
The meiosis is divided into Meiosis I and Meiosis II, each stage subdivided into sub phases.
In prophase I of Meiosis I, nuclear envelope disintegrates, Chromosomes condensed and Spindle fibres are formed.
In Prometaphase II, Spindle fibres bind to the chromosomes at the centromere.
In Metaphase I, homologous chromosomes align at the equatorial plate.
Anaphase I where chromosomes are move towards the opposite poles.
In Telophase I, Spindle fibres disappear, reformation of Nuclear envelope; In Cytokinesis I, 2 non-identical diploid daughter cells are produced.
In Prophase II of meiosis II same event occur like prophase I.
In Metaphase II chromosomes align along the equatorial plate; In Anaphase II, Sister chromatids move to opposite poles.
Telophase II where Nuclear envelope reappear and the spindle fibres disappear; Cytokinesis II where cell divide into 4 non-identical haploid daughter cells.
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What did Chargaff discover while studying bases in the DNA of organisms?
Answer: The ratios of thymine and adenine were similar, as were the ratios of guanine and cytosine.
Explanation:
how does the nucleus control which proteins are made by the ribsomes
Answer: They receive their “orders” for protein synthesis from the nucleus where the DNA is transcribed into messenger RNA (mRNA).
Explanation: This mRNA travels to the ribosomes, which translate the code provided by the sequence of the nitrogenous bases in the mRNA into a specific order of amino acids in a protein.
The images show fossils of a modern bird and two extinct organisms( a Tyrannosaurus rex and archaeopteryx). Based on the structure of the three organisms, it can be concluded that blank . The archaeopteryx and have wings, while dinosaurs have limbs. So, it can be concluded that blank.
Answer:
Many individuals consider that Archaeopteryx would have been the first bird, however, many paleontologists are against it. The findings of many fossils of Archaeopteryx have revealed that though the creature exhibited wings, the majority of its characteristics were of reptile, like the existence of full teeth set. Apart from this, the wings formation of the creature demonstrated that it was not completely capable of flying.
No matter what, the presence of wings makes them closely associated with the modern time birds. Thus, it can be concluded that Archaeopteryx could be considered as an intermediate between the reptiles and the birds and is a precursor to the modern-day birds' evolution.
The students are studying for an exam in pharmacology. They know several local anesthetics have been covered along with other forms. Which medication can they anticipate as being local anethetics on the exam?
a) marcaine
b) xylocaine
c) novocain
Answer:
These are all examples of local anaesthetics a) marcaine(Bupivacaine) b) xylocaine(lidocaine) c) novocain(procaine) are all examples of local anaesthesia
Explanation:
Generally local anaesthetic are drugs used in clinical anaesthesia to block or suppress the sensation of pain at the specific region or part of the body where it was applied.The effect of the application depends on the dose applied and the period of application.
The work by inhibiting transmission of action potential as nerve transmission,through blocking of sodium channels. Thus depolarization is prevented,and nervous transmission to the brain (and therefore pain) is suppressed
Generally pain transmission fibres are blocked first,motor sensation are lost afterwards ,therefore touch sensation and pressure are the last to be lost by the local region.
They are classified into Amide or ester group based on the chemical structures.The examples in the question are amides.
Subcutaneous or epidural administrations can be used to apply