Biology, 29.11.2020 21:10, Wavy10691

In the event of a mismatched nucleotide , which molecule is able to backtrack , "proofread , " and correct the nucleotide sequence ? A. DNA Proofreadase
B. DNA Polymerase
C. DNA Helicase
D. DNA Primase

Answers: 3

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Answers

answered: nicpinela1234

The molecule that is able to get back to the correct the errors in the DNA is DNA Polymerase.

The polymerase is a member of the family of enzymes which synthesis the DNA molecule and forms triphosphate. They are essential for the replication of the DNA.

Hence the option B is correct.

Learn more about the mismatched nucleotide , which molecule.

link.

answered: krazziekidd2p845ri

The molecule that is able to go back and correct an error in the DNA nucleotide sequence is DNA polymerase (option B).

Explanation:

DNA polymerase is not only the enzyme that contributes to the polymerization of a new DNA strand during the replication process, but it can also correct errors in synthesis, such as when a mismatched nucleotide is placed.

Once an error has been detected during synthesis, the DNA polymerase —acting as a 3'-5'- exonuclease— reverses the process, the direction of synthesis, to correct the error which in this case is the mismatched nucleotide.

The other options are not correct because:

A. DNA proofreadasa does not exist.

C. Helicase breaks the hydrogen bridges that bind the nucleotides allowing the separation of the DNA strands. In some cases, it also acts as a DNA repairer

D. DNA Primase is responsible for the synthesis of primers.

answered: Guest

you are certainly talking about this picture:

a: is the label of the white square, it is showing the replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes the dna with the dna template and increases the processivity of the enzyme. ==> stops polymerase from falling off the template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built in the opposite sense of the helicase, so dna will be built in fragments ==> built fragments from 5' to 3 joins

and finally f: is the enzyme that builds the new dna strand (dna polymerase) ==> adds nucleotides to make a new dna helix.

credit: gradman555p98x9p