Answer: 20 amino acids
Explanation:
The triplet nature of the genetic code make for a possible 64 codons: 61 code for amino acids present in most polypeptide chains while the remaining 3 are special-sense codons, since they only signal for the termination of the polypeptide chain.
Thus, due to the degeneracy of the genetic code, the 64 codons code for 20 amino acids
The disease Leber's optic neuropathy is caused by a mutation in a gene carried on mitochondrial DNA. What would be the phenotype of their first child if a man with this disease married a woman who did not have the disease? What would be the result if the wife had the disease and the husband did not?
Answer: the child's phenotype will be normal.
The child will acquire that disease.
Explanation:
The mitochondrial DNA is a small circular chromosome that exists in the mitochondria. The mitochondria is the power house of the cell and all its 37 DNA are essential for a normal function of the mitochondria. the mtdna is passed directly from the mother (through the egg cell) to the child either a male or female but the son cannot pass his mtdna to his child. Thus, if a man with this disease marries a woman not affected, the child's phenotype will be normal. But if the wife has the disease, this willl be passed from her to her child me it a male or female.
Match the following pairs. The series below includes three base pairs that all code for the amino acid methionine (met), which functions to prevent fat deposits from accumulating in the liver. Based on your knowledge of complementary bases and protein synthesis, match the three base pairs with the correct term for it.
A. DNA triplet
B. mRNA codon
C. tRNA anticodon
1. AUG
2. UAC
3. TAC
Answer:
DNA triplet - TAC
mRNA codon - AUG
tRNA anticodon - UAC
Explanation:
A codon is found on the coding strand of double-stranded DNA which includes any three of the four bases (A, G, C, T) also called DNA triplet and in the (single-stranded) mRNA strand including any three of the four bases (A, G, C, U with U replacing T). The anticodon is found on the tRNA and also binds with the codon on the mRNA in order to attach the correct amino acid to the growing peptide chain in the ribosome.
thus for methionine
AUG is the codon on the mRNA (mRNA codon)
UAC is the tRNA anticodon
TAC is the DNA triplet that udergoes transcription to form AUG on the mRNA strand.
Abnormal chromosomes are frequently found in malignant tumors. Errors such as translocations may place a gene in close proximity to different control regions. Which of the following might then occur to make the cancer worse? A) an increase in nondisjunction B) expression of inappropriate gene products C) a decrease in mitotic frequency D) death of the cancer cells in the tumor
Answer:
B) expression of inappropriate gene products
Explanation:
Most of the cancers are caused when a normal gene that code for one or other proteins involved in the regulation of the cell cycle is mutated. The mutated gene may cause the production of the faulty gene products. For example, the overproduction of products of the protooncogene that push cells through the cell cycle leads to tumor formation. Likewise, when the tumor suppressor genes are not able to produce enough product to prevent progression through the cell cycle, cancer may develop.
Your favorite plant is growing very slowly, and you would like to find some way to increase its growth rate. Which of the following should you try increasing first? a oxygen b nitrogen c calcium d sodium
Answer:
The correct answer is b. Nitrogen.
Explanation:
Answer: Option B.
Nitrogen.
Explanation:
Nitrogen is very important for plant growth. It is the major constituent of chlorophyll which trap light energy from sunlight to produce carbohydrates from carbon dioxide and water by a process of photosynthesis. It is components of amino acids which is the building block of protein which enhance plants growths. Nitrogen foster plants growth. Addition of nitrogen inform of nitrate to the soil which boost chlorophyll formation, build up protein for plant growth. With nitogen, the plants will either and die.
In a population of rabbits, f (C1)(C1) = 0.28 and f (C2)(C2) = 0.72. The alleles exhibit an incomplete dominance relationship in which C1C1C1C1 produces black rabbits, C1C2C1C2 tan-colored rabbits, and C2C2C2C2 rabbits with white fur. If the assumptions of the Hardy-Weinberg principle apply to the rabbit population, what are the expected frequencies of: Part A black rabbits. Express your answer using two decimal places.
Answer:
0.08
Explanation:
According to Hardy-Weinberg equilibrium, in absence of an evolutionary force allele frequencies in a population remain constant. In case of polyploid organisms, the formula for Hardy-Weinberg equilibrium is :
(p+q)^c = 1 where,
p = frequency of dominant allele
q = frequency of recessive allele
c = ploidy number
Here, the ploidy number is 4 since there are four chromosomes at a locus instead of the usual two.
f(C1)(C1) = 0.28
f(C2)(C2) = 0.72
Black rabbits = C1C1C1C1
Frequency of black rabbits= f(C1)(C1)*f(C1)(C1)
= 0.28 * 0.28
= 0.0784
= 0.08
collagen is a protein found in connective tissue in animals and lysozyme is a protein that breaks down bacterial cell walls. After looking at figures in your text, what type of protein structure is only found in ONE of these proteins?
Explanation:
Protein structure is the three dimensional game plan of particles in an amino corrosive chain atom. Proteins are polymers explicitly polypeptides framed from groupings of amino acids, the monomers of the polymer.By show, a chain under 30 amino acids is regularly distinguished as a peptide, rather than of a protein. All proteins have primary, auxiliary and tertiary structures yet quaternary structures possibly emerge when a protein is comprised of at least two polypeptide chains. The collapsing of proteins is additionally determined and fortified by the arrangement of numerous bonds between various pieces of the chain.Connective tissues for the most part have barely any cells and extensive extracellular filaments including collagen and elastin. Collagen is the absolute most abundant protein in the creature body and establishes roughly 25–35% of the entire body content.11. Which structure is found in the inner medulla of the kidney?
A. Bowman's capsule
B. loop of Henle
C. glomerulus
D. proximal convoluted tubule
Answer: Option B) loop of Henle
Explanation:
The longitudinal section of the kidney has two distinct regions: an outer cortex and an inner medulla. The outer cortex has the following parts: glomerulus, bowman's capsule, convoluted tubule; while the inner medulla has the loop of Henle, a U-shaped loop that comes from the proximal convoluted tubule found in the medulla.
Answer: Option B.
Loop of henle.
Explanation:
The kidney longidutinal section is divide into inner and outer medulla.
The outer contain the Bowman's capsule, glomerulus e.t.c . The inner medulla of the kidney contains the loop of henle
Loop of henle is a long u shaped like part , found in the Inner medulla of the kidney. It move urine from each nephron of the kidney. It help to reabsorb water and sodium chloride from the urine. It carries filtrate from the proximal tubule to the renal medulla and move it back to the renal cortex.
Proto‑oncogenes are genes that have the potential to become oncogenes through either mutation or an increase in expression. Classify the statements as describing proto‑oncogenes or tumor suppressor genes.
Answer:
Proto-oncogenes
These genes code for protein that normally promote cell divisionMutations that increase activity of these genes may lead to cancerTumor suppressor genes
These genes code for protein that normally prevent uncontrolled cell divisionSome products of these genes normally function in repairing damaged DNAMutation that decrease activity of these genes may lead to cancer.Explanation:
Proto-oncogenes are group of genes that ordinarily help cells develop. At the point when a proto-oncogene mutates or there are such a large number of duplicates of it, it turns into a "terrible" quality that can turn out to be forever turned on or activated when it shouldn't be. At the point when this occurs, the cell becomes wild, which can prompt malignant growth. This terrible quality is called an oncogene.
Tumor suppressor genes are normal gene that hinder cell division, fix DNA missteps, or tell cell when to undergo apoptosis (die). At the point when tumor suppressor gene don't work appropriately or inactivated, cells can develop uncontrollable growth, that ultimately lead to cancer.
Which are true of stroke volume? Choose all correct. (20) a. It is the volume ejected per beat. b. An average resting value for stroke volume is 5 L/min. c. Cardiac output is inversely related to stroke volume. d. Mathematically, stroke volume equals EDV-ESV.
Answer:
a. It is the volume ejected per beat
d. Mathematically, stroke volume equals EDV-ESV.
Explanation:
Stroke volume refers to the volume of blood which is expelled out by the left ventricle of the heart to the body.
The stroke volume can be measured with the echocardiogram which measures the EVD or End-diastolic volume which represents the volume before the contraction of the ventricle and the ESV or End-systolic volume which represents the residual volume after the contraction.
The Stroke volume is calculated by the difference between the EDV and ESV. The stroke volume for a normal person is measured is 70 mL per sec.
Thus, the selected option is correct.
Imagine that black ash from multiple volcano eruptions made photosynthesis impossible anywhere on Earth for many years. What would be the consequences to plants and animals? How would microbes (bacteria and Archaea) be affected?
Answer:
Without Photosynthesis plants and animals won't exist.
Explanation:
Photosynthesis is a process through with plants and other living things makes food. It is a chemical reaction which is endothermic in nature that uses sunlight to turn Carbon dioxide into sugar,in order for the cells to use to perform Work.
The occurance of volcano as described in the question happens to disrupt the Continuous occurance of photosynthesis and this in turn will greatly affect the existence of plants and animals. We can simply say plants and animals can not exist without Photosynthesis.
This is because photosynthesis releases a large amount of oxygen into the atmosphere , of which both plants and animals make use of.
If I may ask how do you feel staying in an atmosphere with limited supply of oxygen ? Of course you feel suffocated and you feel you are dieing. That is exactly the scenario we are analysising now.
Some group of sea organism that doesn't depends on photosynthesis will still survive never the less. But organisms that takes in Oxygen and gives out Carbondioxide have a higher rate of not surviving.
Carbon absorbs energy at a wavelength of 150. nm. The total amount of energy emitted by a carbon sample is J. Calculate the number of carbon atoms present in the sample, assuming that each atom emits one photon.
The given question is incomplete. The complete question is as follows.
Carbon absorbs energy at a wavelength of 150 nm. The total amount of energy emitted by a carbon sample is [tex]1.93 \times 10^{5} J[/tex]. Calculate the number of carbon atoms present in the sample, assuming that each atom emits one photon.
Explanation:
It is given that the energy at which C-atom absorbs energy is 150 nm. So, energy emitted by the carbon atom will have same wavelength at which C-atom absorbs the energy.
As we know that relation between energy and wavelength is as follows.
E = [tex]\frac{hc}{\lambda}[/tex]
where, h = Planck's constant = [tex]6.624 \times 10^{-34} J sec[/tex]
c = speed of light = [tex]3 \times 10^{8} m/s[/tex]
[tex]\lambda[/tex] = 150 nm = [tex]150 \times 10^{-9}[/tex]
Therefore, energy of one carbon atom is calculated as follows.
E = [tex]\frac{hc}{\lambda}[/tex]
= [tex]\frac{6.624 \times 10^{-34} Js \times 3 \times 10^{8} m/s}{150 \times 10^{-9}}[/tex]
= [tex]1.324 \times 10^{-18} J[/tex]
As the total energy emitted by the carbon sample is [tex]1.93 \times 10^{5} J[/tex]. Let us assume that the number of C-atoms in the sample be x and it is calculated as follows.
[tex]E_{total} = n \times E_{1C-atom}[/tex]
n = [tex]\frac{E_{total}}{E_{1C-atom}}[/tex]
= [tex]\frac{1.93 \times 10^{5}}{1.324 \times 10^{-18} J}[/tex]
= [tex]1.45 \times 10^{23}[/tex]
Thus, we can conclude that number of carbon atoms present in the sample, are [tex]1.45 \times 10^{23}[/tex].
Please help !!! Explain how a change in an abiotic factor, such as sunlight, would affect biodiversity.
Answer:Loss of plant growth
Explanation:
Answer:
A change in an abiotic factor could affect the biodiversity of an eco system negatively.
Explanation:
For instance, if sunlight were dramatically decreased in a rainforest, the trees would die because they ned sunlight to produce food. this means that the monkeys, birds and other organisms wouldn't have a home and would have to leave the rainforest.
Who criticized Marx for focusing exclusively on economics and social class as explanations for human behavior and advocated sociological analyses that allowed for multiple influences, including ideas and beliefs of people?
Answer:
The answer is Max Weber.
Explanation:
Max Weber assumed that society and the problems of governments were dominant consequences in society, and the enhancement of balance was transformed into an establishment in sociology. In society, culture, ideas, religion, etc., they contribute to the prosperity of the social order. The subjective for Max Weber became the interpretative in human science.
If you were a scientist studying how the building of dams by a beaver population in a forest affected river water flow, soil nutrient content, and the dynamics of other populations that rely on the river water, such as fish and amphibians, you would be a specialist at what level of biology?
Answer:
Specialist of High Average Level
Explanation:
While studying all these factors affecting the environment at the same time. One should have a High Average intellect of knowledge related to Aquatic, Marine, Soil, Microbial, Forest, Zoology, Botany, Demography as well as enough knowledge related to Bio-Physics. Only then, he'll be able to tell about the consequences related to the situation.
A scientist studying the effects of beaver dams on river ecosystems would be an ecosystem ecologist, a role that involves examining the intricate interactions between organisms and their environment, including the impact on water flow, soil nutrients, and species dynamics.
Explanation:Understanding the Level of Ecological StudyIf you were a scientist studying the impact of beaver dams on river water flow, soil nutrient content, and the dynamics of other populations such as fish and amphibians, you would be operating at the ecosystem level of biology within the field of ecology. Ecosystem ecologists examine the relationships between living organisms, including humans, and their physical environment. They focus on understanding how ecosystem components, such as the water flow and soil nutrients affected by beaver dams, interact and affect the distribution and abundance of organisms in a particular habitat.
Beaver dams can have profound effects on river ecosystems. By altering water flow and sediment distribution, these ecosystem engineers can change the dynamics of aquatic and terrestrial interfaces, influence nutrient cycles, and affect the biodiversity and health of wetlands. Changes to these ecosystems can notably impact populations of fish and amphibians, which depend on specific flow regimes and access to aquatic and terrestrial habitats for their life cycles.
Ecologists interested in conservation biology might also draw on habitat modification studies, as damming can drastically influence ecosystem dynamics. Key informed decisions for biodiversity conservation and restoration often rely on understanding such complex interactions. By investigating and modeling these impacts, ecosystem ecologists contribute valuable insights into sustainable management practices that can mitigate the effects of human intervention on natural habitats.
A rooster with white feathers is mated with a gray hen of the same phenotype. Among their offspring, 28 chicks are gray 31 are white. What is the simplest explanation for the inheritance of these colors in chickens?
Answer:
The chickens that were born from this cross show incomplete dominance.
Explanation:
The colors of chicken feathers are determined by two genes. A dominant "A" gene that determines black color and a recessive "a" gene that determines white color. In addition, chickens may present the gray color that occurs when the alleles establish an incomplete dominance, which is the type of inheritance that happens when a heterozygous individual (presents the Aa alleles) has an intermediate characteristic in relation to the characteristics determined by the two alleles .
Based on this, we can say that at the crossing shown above, there was an inheritance determined by incomplete dominance.
The inheritance of feather colors in chickens, given the mix of gray and white offspring, suggests a pattern of codominance, where the genes for white and gray feathers are neither dominant nor recessive and are expressed together in the offspring.
When a rooster with white feathers is mated with a gray hen and they produce both gray and white offspring, it appears that neither the white nor gray color is completely dominant over the other. Instead, each phenotype is expressed in the offspring, suggesting a codominant pattern where the alleles for feather color are neither dominant nor recessive and are expressed simultaneously in a unique phenotype, as is common in certain chicken breeds.Comparatively, in some other contexts, the colors may blend and display an intermediate phenotype, which is characteristic of incomplete dominance. For example, if black and white mice breed and result in all gray offspring, it would demonstrate incomplete dominance, where the black and white alleles blend to produce gray. An example in plants would be the snapdragon, where red and white parents result in pink offspring. However, in the case provided, since there are distinct gray and white offspring, codominance seems more likely.
Why do RNA viruses appear to have higher rates of mutation?
A) RNA nucleotides are more unstable than DNA nucleotides.
B) Replication of their genomes does not involve the proofreading steps of DNA replication.
C) RNA viruses replicate faster.
D) RNA viruses can incorporate a variety of nonstandard bases.
E) RNA viruses are more sensitive to mutagens.
Answer:
B) Replication of their genomes does not involve the proofreading steps of DNA replication.
Explanation:j
1. This is because RNA polymerase do not proofread proteins or polymerase components to check for errors and repair.
2.Because RNA viruses usually encoded their replication machinery, therefore they have the ability to replication at high rate which increases chances for mutation, to any length and extent to suits their needs.
Therefore,since there is no check for the number of replication they can go through and no need for correction of replication errors, they have rapid chances for mutation and therefore virulence. Different offspring, with distinct genetic composition from wrong bases insertion and translation and therefore of virulence totally different from the parents will be produced. Thus mutagensis, and virulence continues to increase.
RNA viruses have higher mutation rates primarily because their replication lacks DNA's proofreading mechanisms, making RNA-dependent RNA polymerases more error-prone, facilitating genetic variability and adaptation. So option B is correct choice.
RNA viruses tend to have higher mutation rates primarily because their replication process lacks the proofreading mechanisms present in DNA replication.
During DNA replication, enzymes like DNA polymerase have built-in proofreading capabilities, which help to correct errors in base pairing, resulting in a relatively low mutation rate.
In contrast, RNA viruses typically lack these proofreading mechanisms during genome replication. RNA-dependent RNA polymerases, the enzymes involved in replicating RNA genomes, are more error-prone, leading to a higher likelihood of mutations.
This elevated mutation rate contributes to the genetic variability seen in RNA viruses, allowing them to adapt more rapidly to changing environments, evade host immune responses, and potentially develop resistance to antiviral treatments.
While factors such as the instability of RNA nucleotides (option A) and the speed of replication (option C) can contribute to higher mutation rates, the absence of proofreading during replication (option B) is the primary reason for the observed higher mutation rates in RNA viruses.
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Animals and most microorganisms are classified as chemoorganoheterotrophs. The prefixes "chemo," "organo," and "hetero" refer to how the organism meets its needs, respectively, for:
(A) electrons, carbon, and energy
(B) carbon, energy, and electrons
(C) electrons, energy, and carbon
(D) energy, electrons, and carbon
(E) carbon, electrons, and energy
Answer: Option A.
Electrons,carbon and energy.
Explanation:
Chemorganoheterotrophs are organisms that uses organic substrates to produce carbon needed for their growth and development. They derive their energy from oxidation and reduction of organic substances. The use the reduced carbon produced by autrotophs as as source of electrons, carbon and energy. Example is fungi that uses carbon as electron donor and source for carbon and energy.
A single Na+/K+ ATPase pump is present in the plasma membrane of an artificial cell with an initial cellular environment of 500 molecules of Na+ and 1000 molecules of ATP inside the cell, 500 molecules of K+ outside the cell, and a net charge differential across the plasma membrane of 0. Assuming the only changes in the cellular environment are a result of the pump's actions, what would be the number of Na+, K+ and ATP molecules inside the cell after 10 cycles of the pump and what would be the net charge differential (inside - outside) across the plasma membrane?
a. 300 Na+; 200 K+; 100 ATP and -100 charge differential (inside - outside)
b. 470 Na+; 20 K+; 990 ATP and -20 charge differential (inside - outside)
c. 30 Na+; 20 K+; 900 ATP and -10 charge differential (inside - outside)
d. 470 Na+; 480 K+; 10 ATP and +100 charge differential (inside - outside)
e. 30 Na+; 480 K+; 10 ATP and +20 charge differential (inside - outside)
Answer:
the correct option is A
Explanation:
the correct option is A, because a sodium-potassium pump in a cell requires ONE molecule of ATP for each cycle and exchanges 3 units of sodium for two of potassium, that is why also as the Potassium inside the cell and sodium is excreted in the extracellular medium, the interior value of the cell begins to become negative.
Sodium potassium pumps are fundamental pumps for cellular osmotic balance and are ATP dependent, this means that they need energy to operate.
The number of Na⁺ and K⁺ and the net charge differential (inside-outside) across the plasma membrane - (b) 470 Na+; 20 K+; 990 ATP and -20 charge differential (inside-outside)
Given:
Inside the cell
500 molecules - Na⁺
1000 molecules - ATP.
Outside the cell,
500 molecules - K⁺.
Solution:
we know that,
The Na⁺/K⁺ ATPase pump expels 3 molecules of Na+ and enters 2 molecules of K+ with every pump and it costs 1 ATP
Let assume there's only one Na⁺/K⁺ ATPase and there are no other changes in the cellular environment, and the Na⁺/K⁺ ATPase pumps 10 times,
Then,
So, after 10 cycles of pumping,
30 - Na⁺ move out and
20 - K⁺. get in the cell
the cost of - 10 ATP molecules.
Therefore, the net balance of the pumping action:
Inside the cell:(500-30) sodium ions, (1000-10) ATP and 20 potassium ions
= 470 sodium ions, 990 ATP, 20 potassium. Total charge = 490
Outside the cell:(500-20) potassium ions, 30 sodium ions
= 480 potassium ions, 30 sodium ions. Total charge = 510
So, charge difference (inside-outside)
= 490-510
= -20
Thus, The number of Na⁺ and K⁺ and the net charge differential (inside-outside) across the plasma membrane - (b) 470 Na+; 20 K+; 990 ATP and -20 charge differential (inside-outside)
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To aid inhalation, both the diaphragm and intercostal muscles are used. By expanding the thoracic cavity, the action of these muscles creates a space with _____ atmospheric pressure.
Answer: lower atmospheric pressure
Explanation:
During the inspiration process the diaphragm, and external intercostal muscles. The contraction of the diaphragm causes the increase in the size of the thoracic cavity this causes the contraction of the external intercostal muscles. As a result of this the ribs and the sternum get elevated.
This causes the lungs to expand, and increasing the volume of the air passage. In this response the air pressure inside the lungs reduces below the air outside the body. Thus this facilitates the movement of the gases from a region of high pressure to low pressure, this way the air rushes into the lungs.