A true reversion occurs when the wild-type DNA sequence is restored to encode its original message by a second mutation at the same site or within the same codon. Which of the following isoleucine codon(s) could be mutated once to form a methionine codon, and then mutated at a second site to restore an isoleucine codon?
A. AUC.
B. AUU.
C. AUA.
D. None of these codons.

Answers

Answer 1

Answer:

The correct answer is option d- none of these.

Explanation:

The genetic code for methionne is AUG and genetic code for isoleucine are AUC, AUA, AUU. As we can see that there are first two codons are similar for both methionine and isoleucine.

So mutation at to any other site other than third psostion not possible that can convert isoleucine to methionine and this same mutation site is the only mutation position mutation can revere back methionine to isoleucine.

Thus, none of the given can restore an isoleucine codon.


Related Questions

what are microorganisms? write the living and non living characteristics of virus. ​

Answers

Answer:

In easy word ......the virus or organism that can only be seen through Microsoft is called microorganisms

Explanation:

Those organisms which cannot be seen under naked eyes and require microscope to be seen are called micro-organisms.

The main living character of the viruses is they contain DNA or RNA as the genetic material. The main non-living character of the viruses is they can be crystallized like other chemicals

Hope ,this helps you!

Life cycle of peziza

Answers

growth stage

While the pizza category was in the growth stage, the product life cycle of long-lived products was observed in the rice category.


The_____states that the distribution of the sample means tend to be
approximately normal as sample sizes increase.
A. Intermediate Value Theorem
B. Sample Values Theorem
C. Central Limit Theorem
D. Approximate Values Theorem

Answers

Answer: C. central limit theorem

Explanation:

What is
FOOD & NUTRITON 1​

Answers

Answer:

1 How food keeps us healthy. Food is needed for energy and nutrients to exist, it provides energy for work, and warmth for the body. Everybody also needs food to build, maintain and repair their body. It is also required for control of body processes and for protection against disease and infections.

Answer:

Any nutritious substance that people or animals eat or drink or that plants absorb in order to maintain life and growth.

Nutrition is the biochemical and physiological process by which an organism uses food to support its life.

vì sao DNA của Prokaryote phải siêu xoắn

Answers

Answer:

poop

Explanation:

poop

Explain why succession allows an ecosystem to recover after a primary disturbance.

Answers

Answer:

succession allows an ecosystem to recover from a primary disturbance because theorganisms that moves in helps to rebuild the soil that may have been affected.

Replication of eukaryotic DNA a. must be controlled to coordinate with the cell cycle b. takes place twice during each cell cycle c. must occur faster than replication of prokaryotic DNA d. takes place during mitosis

Answers

C. must be controlled to coordinate with the cell cycle

Hope this helps :)

What is the role of pitutary gland in puberity

Answers

Answer:

Puberty has begun. The trigger for puberty in both boys and girls is the production of 'gonadotrophin releasing hormone' (GnRH) from a part of the brain called the hypothalamus. This hormone stimulates the pituitary gland to release two hormones, Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH).

Explanation:

Please Mark me brainliest

Answer:

the gland produce hormones that help to regulate growth and body functions.

Which is our body part help us to maintain balance.

Answers

Answer:

cerebellum

Explanation:

The cerebellum is a small part of the brain positioned at the back of the head, where it meets the spine, which acts as the body's movement and balance control centre.

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Tai không chỉ có vai trò để lắng nghe mà còn hỗ trợ trong việc giữ cân bằng

Explain why the lack of surfactant would result in respiratory distress. Furthermore, what type of acid-base disorder might she develop and how would her body compensate. Be detailed in your explanation and support your answer with facts from your textbook, research, and articles from scholarly journals.

Answers

Answer:

Due to lack of expansion of lungs.

Explanation:

The lack of surfactant compound would result in respiratory distress because Surfactant enables the lungs to expand more easily which allows easiness in respiration. Without surfactant, the air sacs in the lungs will collapse very easily. This collapse leads to decreased amounts of air or oxygen in the lungs which makes it very difficult for the people or infant to breathe.

which of the following trairs did Mendel not test
1.) Flower position
2.) Seed color
3.) Number of seeds
4.) Stem length​

Answers

3) number of seeds and 4.) stem length

In this experiment, you are looking at the effect of various germicides on microbial growth. The organism that you are using for this experiment is baking yeast, which is a eukaryote. Do you think that this organism would be more or less susceptible to the various germicides than a prokaryotic organism, such as bacteria?

Answers

Answer:

Less susceptible.

Explanation:

This organism would be less susceptible to the various germicides than a prokaryotic organism, such as bacteria because the form and structure of eukaryotic organism is different from the prokaryotic organism so the germicides no or less affected the eukaryotic organism so we can say that the  the eukaryotic organism which is used in baking would be less susceptible to the various germicides than a prokaryotic organism.

The MN blood group in humans is under the control of a pair of co-dominant alleles, M (we will call the frequency of M, p) and N (we will call the frequency of N, q). In a group of 556 individuals, the following numbers of individuals are found for each of the genotypes:
167 MM
280 MN
109 NN
a) What is the frequency of each allele? p= q=
b) What is the value of the Chi-square statistic test to find if in this particular case the genotypic frequencies conform to the Hardy-Weinberg distribution.
Chi square value =
c) What is the probability associated with you chi square statistic calculated above? Please complete the blanks below with the corresponding symbol, < OR > than the critical value, your conclusion with respect to the null hypothesis of Hardy Weinberg equilibrium, Retain or Reject.
P value __ than 0.05
Conclusion ___ the null hypothesis of HW equilibrium

Answers

Answer:

a) f(M) = p = 0.55

   f(N) = q = 0.45

b) X² = 12.12

c)  P₀.₀₅ = 5.991

d) P₀.₀₅ < X²

e) Reject the null hypothesis of HW equilibrium

Explanation:

Due to technical problems, you will find the complete explanation in the attached files

what is the difference of biology and human and social biology?????

Answers

Answer:

Man's health (human biology) affects and effects change on society (social biology). Human and social biology scrutinizes the human body, disease, health, nature and the environment's influence on biology.

Answer:

Man's health (human biology) affects and effects change on society (social biology). Human and social biology scrutinizes the human body, disease, health, nature and the environment's influence on biology.

Hope this helped! Good luck! :)

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Describe fluid exchange between capillaries and the interstitial fluid. Be sure to discuss the forces (pressure) that moves the fluid and the direction in which fluid moves. (4 points) In one to three sentences, describe the role of lymphatic system in this fluid exchange. (3 points) g

Answers

Answer:

Capillary exchange is the exchange of fluid from the capillaries into the interstitial fluid and vice versa. Diffusion, transcytosis, and bulk flow are three mechanisms that facilitate capillary exchange.

The blood plasma or interstitial fluid exerts a pressure of the fluid on the capillary walls known as Hydrostatic pressure. Osmotic pressure is a pressure exerted by proteins either in the blood plasma or interstitial fluid called oncotic pressure.

Lymphatic capillaries gather lymphatic fluid and regulate the pressure of interstitial fluid due to the forces of hydrostatic or oncotic pressure. An essential role of the lymphatic system is to return the fluid to the blood.

The catabolic pathways that degrade fatty acids do not generate ATP directly, but produce NADH and acetyl-CoA.

a. True
b. False

Answers

Answer:

b.False

Explanation:

Which is the only element in group 1 on the periodic table that forms covalent bonds?

hydrogen
lithium
potassium
sodium
.

Answers

Answer:

Hydrogen

Explanation:

Hydrogen is the only nonmetal in group 1, therefore it is the only element in group 1 that forms a covalent bond.

Answer:

A.

Explanation:

describe any four factors affecting the distribution and diversity of crustaceans in marine ecosystems

Answers

Answer:

En marina es: sobre pesca, cambio climático, especies invasoras, acuicultura. En terrestres es: inundaciones, calentamiento global, gases de invernadero, radiación reflejada.Explanation:ponme corona

Which of the following combinations of phylum and description is correct? (and why?)
a) Nematoda − roundworms, internal skeleton
b) Porifera − gastrovascular cavity, coelom
c) Echinodermata - radial symmetry as a larva, coelom
d) Platyhelminthes − flatworms, gastrovascular cavity, no body cavity

Answers

it’s answer c!! i just took that and i got it right

The phylum and description that is correct among the options is Platyhelminthes − flatworms, gastrovascular cavity, no body cavity

Flatworms belongs to the phylum platyhelminthes. They are said to have no true body cavity, but they do have bilateral symmetry. For the lack of a body cavity, it is called acoelomates.

They also have an incomplete digestive system. That is, the digestive tract has only one openings

From the above we can therefore say that Option d is the correct option that gives the true description of the phylum platyhelminthes

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https://brainly.com/question/15399960

Define Siamese twins

Answers

Answer:

Conjoined twins are two babies who are born physically connected to each other. Conjoined twins develop when an early embryo only partially separates to form two individuals. Although two fetuses will develop from this embryo, they will remain physically connected — most often at the chest, abdomen or pelvis.

In a study involving a cell-free translation system from coli, the polyribonucleotide AUGUUUUUUUUUUUU directs the synthesis of the oligopeptide fMet-Phe-Phe-Phe-Phe. In the presence of a new class of translation-targeting antibiotics that bind to the large ribosomal subunit, the ribosomal complex forms, the initiator tRNA binds the mRNA, the second tRNA enters the A site of the ribosome, but no peptide bonds form. Which of the following is a likely function of these new antibiotics?

a. Blocks peptidyl transferase activity
b. Inhibits tRNA aminoacyl synthetase function
c. Inhibits ribosomal translocation along the mRNA
d. Prevents anticodon base-pairing with the codon
e. Blocks binding of the Shine-Dalgarno box to the rRNA

Answers

Answer:

c. Inhibits ribosomal translocation along the mRNA.

Explanation:

Initiator tRNA is thought to bind directly to P-site of small ribosomal sub unit. These tRNA are positioned at P site and remain attached to tRNA located at this site. Initiation factor helps to mediate this event.

At this point, the writer is considering adding the following sentence. Successful nerve impulse transmission depends not only on myelin sheaths, but also on the presence of ion pumps embedded in the cell membrane. Should the writer make this addition here?
A) Yes, because it describes how the presence of ion pumps is related to the functions of cholesterol.
B) Yes, because it supports the passage’s main argument with a second example of cholesterol’s potential adverse health effects.
C) No, because it identifies a relationship between the nervous system and ion pumps that has already been discussed.
D) No, because it interrupts the paragraph’s discussion of cholesterol’s functions with loosely related information.

Answers

Answer:

D) No, because it interrupts the paragraph’s discussion of cholesterol’s functions with loosely related information.

Explanation:

The passage was discussing the importance of cholesterol in nerve impulse transmission. Its presence in the myelin sheaths of nerve cells speeds up nerve impulse transmission. It will not be wise for the author to now bring in the relationship between nerve impulse transmission and ion pumps. This is because the main topic under discussion is cholesterol and its importance. The sentence should be continued with other importance of cholesterol and not ion pumps.

HELP PLEASE FAST ASAP PLEASE HELP

Answers

Answer:

D. Their ability to replicate very fast and natural mutations combine to allow them to evolve rapidly

Explanation:

They develop mutations in their DNA that can be resistant to the drugs given.

is a pollen grain a cell

Answers

Long story short YES

Partes del sistema linfatico

Answers

Answer:

Explanation:

Le parti principali del tessuto linfatico sono il midollo osseo, la milza, la ghiandola del timo, i linfonodi, i linfonodi e le tonsille.

Match the items of column 'A' with those of column 'B':
Turbidity
Reduces the light in the water column
Natural pollution
Choose
Nitrates and phosphates
Air pollution
Biochemical demand for oxygen
Contaminants into a natural environment
Chemical fertilizers
Pollution
Floating materials
Industrial wastes
Emissions pollution
Reduces the light in the water column
Concentration of hydrogen pH
Eutrophication
CFCS
New species invasion
Temperature
Harmful algal blooms
Oils fats, and foam
Please answer all parts of th Hypertrophication
Toxicity
Volcanic
In crude oil affect eggs and larvae of fish a
Atomic number
a. Hydrocarbon

Answers

Answer:

Match the items of column 'A' with those of column 'B':

Turbidity

Reduces the light in the water column

Natural pollution

Choose

Nitrates and phosphates

Air pollution

Biochemical demand for oxygen

Contaminants into a natural environment

Chemical fertilizers

Pollution

Floating materials

Industrial wastes

Emissions pollution

Reduces the light in the water column

Concentration of hydrogen pH

Eutrophication

CFCS

New species invasion

Temperature

Harmful algal blooms

Oils fats, and foam

Please answer all parts of th Hypertrophication

Toxicity

Volcanic

In crude oil affect eggs and larvae of fish a

Atomic number

a. Hydrocarbon

Which of the following describes the product of Meiosis?
A. 4 genetically identical diploid cells
B. 4 genetically unique diploid cells
C. None of these are correct
D. 2 genetically unique haploid cells

Answers

Answer:

C

Explanation:

meiosis made 4 haploid daughter cells, with 1 round of dna replicates and followed by 4 division of haploid daughter cells

QUESTION 6
Which one of the following substances is not a product of aerobic respiration?
A.
ATP
B.
Water
C.
Alcohol
D. Carbon dioxide​

Answers

Answer:

C. alcahol

Explanation:

aerobic respiration equation

glucose+ oxygen -> carbob dioxide gas + water + energy

Answer:C

Explanation:

What type of cells are produced during
meiosis?

A. asexual cells
B. diploid cells
C. division cells
D. haploid cells

Answers

Answer:

D. haploid cells

Explanation:

Meiosis results in 4 gametes with 23 unpaired chromosomes, making them haploid cells.

Which graph represents selection that may lead to reduced variation in a population?
A graph has trait value on the horizontal axis and population of individuals on the vertical axis. The original population and population after selection have similar curves, but the original population peaks before the population after selection.
A graph has trait value on the horizontal axis and population of individuals on the vertical axis. The population after selection increases, decreases, increases, and then decreases again. The original population increases at the point that the original population drops.
A graph has trait value on the horizontal axis and population of individuals on the vertical axis. The original population peaks at the same time as the population after selection but the population after selection peaks higher and at a more rapid speed.
A graph has trait value on the horizontal axis and proportion of individuals on the vertical axis. The original population and population after selection have similar curves but the original population is slightly higher at all points.

Answers

Answer:

A graph has trait value on the horizontal axis and population of ... selection have similar curves, but the original population peaks

Answer:   graph B

Explanation:   :)

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