Table of Contents
What enzyme removes DNA?
helicase
In nucleotide excision repair, the damaged nucleotide(s) are removed along with a surrounding patch of DNA. In this process, a helicase (DNA-opening enzyme) cranks open the DNA to form a bubble, and DNA-cutting enzymes chop out the damaged part of the bubble.
What enzyme Untwists and unzips DNA?
AP Chapter 16 – Molecular Basis of Inheritance (detailed)
| A | B |
|---|---|
| The enzyme that joins RNA nucleotides to make the primer is called ____. | primase (letter B in the picture below), |
| The enzyme that untwists and unzips the double helix of DNA at the replication forks is called ____. | helicase (letter A in the picture below), |
What are Untwists strands of DNA?
Helicases are enzymes that are responsible for untwisting the double helix at the replication forks, separating the two strands and making them available to serve as templates for DNA replication.
What enzyme unwinds or unzips the parent strand?
DNA helicase
During DNA replication, an enzyme called DNA helicase “unzips” the molecule of double-stranded DNA.
How does DNA polymerase bind to DNA?
Since DNA polymerase requires a free 3′ OH group for initiation of synthesis, it can synthesize in only one direction by extending the 3′ end of the preexisting nucleotide chain. Hence, DNA polymerase moves along the template strand in a 3′-5′ direction, and the daughter strand is formed in a 5′-3′ direction.
Is guanine A DNA?
Guanine. Guanine (G) is one of four chemical bases in DNA, with the other three being adenine (A), cytosine (C), and thymine (T). Within the DNA molecule, guanine bases located on one strand form chemical bonds with cytosine bases on the opposite strand.
Which enzyme Untwists and separates the DNA double helix?
Helicase
Guanine—one of the nucleotides that make up DNA and RNA. Helicase—an enzyme which untwists the double helix and separates the template DNA strands at the replication fork during DNA replication.
Which enzymes help prevent Supercoiling?
Two DNA topoisomerases control the level of negative supercoiling in bacterial cells. DNA gyrase introduces supercoils, and DNA topoisomerase I prevents supercoiling from reaching unacceptably high levels.
Which enzyme unzips DNA strand?
DNA helicase is the enzyme that unzips DNA strands during replication. It catalyzes a reaction that breaks the hydrogen bonds between complementary bases of two DNA strands, unwinding the double helix.
Which direction does helicase move?
A helicase is an enzyme that unzips joined strands of deoxyribonucleic acid (DNA) or ribonucleic acid (RNA). It usually moves in one direction down a double-stranded DNA molecule or self-bound RNA molecule, breaking the hydrogen bonds between the complementary nucleotide base pairs.
What enzyme removes RNA primer?
DNA polymerase I is the enzyme that removes the RNA primer during replication.
What enzyme adds complementary bases?
DNA Polymerase. The most important enzymes, that carry out the main task of aligning the complementary bases with template strands of ‘unzipped’ DNA, are the DNA polymerases. They are a large family of enzymes that carry out the task of adding complementary base nucleotides, by reading the template strands.