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yawa3891 [41]
3 years ago
7

What is the function of topoisomerase? a. relieving strain in the DNA ahead of the replication fork b. elongation of new DNA at

a replication fork by addition of nucleotides to the existing chain c. the addition of methyl groups to bases of DNA d. stabilizing single-stranded DNA at the replication fork e. unwinding of the double helix
Biology
1 answer:
icang [17]3 years ago
6 0

Answer:

A- Relieving strain in the DNA ahead of replication fork.

Explanation:

During transcription or replication, DNA double helixed strand unwinds catalysed by the helicase enzyme, they break the hydrogen bonds that holds the two strands together. When DNA unwinds, supercoils are created in the replication fork, if it is not dealt with, transcription or replication will come to a halt. Topoisomerase enzymes are there to relieve DNA by cutting the phosphate backbone of either single or both strands of DNA, preventing supercoils.

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Answer: B

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3 years ago
How might dr. Mombutubwa recognize and successfully diagnose Ebola in his patients?
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3 years ago
2.Which of the following represents a genetic cross between 2 individuals that are each heterozygous for both traits?
wariber [46]

Answer:

A. AaBb x AaBb

Explanation:

The term heterozygous refers to the presence of two different alleles of same gene in an organism. The one allele can be of wild type (original type) and one can be mutated or newly formed.

In the question, two traits are represented by two letters, A and B and alleles as A and a and B and b, respectively. We are asked about a cross involving two traits and two individuals in such a way that both are heterozygous.

If we look at option A, AaBb x AaBb,

we see that one trait A and the other trait B is in heterozygous form (Aa and Bb) in both individuals.

If we look at option B. AABB x AABB

we see that one trait A and the other trait B is in homozygous form form (AA and BB) in both individuals. Homozygous means when the alleles are same for each trait in an individual.

If we look at option C,Aa x Bb

There are not two traits, one trait of one individual and other trait of other individual is being crossed that is not possible.

If we look at option D. AAaa x BBbb

Again, the individuals are homozygous for two traits.


Therefore, A is best option.


Hope it helps!

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3 years ago
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As you talk in animals
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3 years ago
The inheritance pattern for snapdragon flower color exhibits incomplete dominance. a snapdragon that is homozygous for the red a
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Genotypic wise, all of the offspring will be heterozygous.
7 0
3 years ago
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