Table of Contents
Which enzyme catalyzes the elongation of a DNA strand quizlet?
DNA polymerase is the enzyme that catalyzes the addition of a nucleotide onto the 3′ end of a growing DNA strand.
Which enzyme in E coli catalyzes the elongation of a DNA strand in the 5 → → 3 direction?
coli, the enzyme primase is used to attach a 5 to 10 base ribonucleotide strand complementary to the parental DNA strand.
Which enzyme catalyzes synthesis of a new strand of DNA?
DNA polymerase
So, the correct option is ‘DNA polymerase’.
What is the function of helicase?
Helicases are the proteins that bind to double- or single-stranded DNA and/or RNA chains to unwind higher order structures, usually consuming energy from the hydrolysis of ATP molecules.
What is the major elongation enzyme?
All the enzymes are needed except RNA polymerase. Two kinds of DNA polymerase are used….2) 15 pt.
| Column A | Column B | |
|---|---|---|
| D | b) Is an RNA polymerase | B Polymerase III |
| A B | c) Is a DNA polymerase | C) helicase |
| B | d) is the major elongation enzyme | D) Primase |
| A B D | e) A 5′ to 3′ polymerase | E) Ligase |
What is the function of DNA polymerase 3 in E. coli?
DNA polymerase III holoenzyme is the enzyme primarily responsible for replicative DNA synthesis in E. coli. It carries out primer-initiated 5′ to 3′ polymerization of DNA on a single-stranded DNA template, as well as 3′ to 5′ exonucleolytic editing of mispaired nucleotides.
What is the function of DNA polymerase 2?
DNA polymerase I and II have a role to play in repair, removing the primer and filling the gaps. In eukaryotes, DNA polymerase 𝝳 is the main enzyme for replication. Other DNA polymerases are involved in the repair, proofreading and primer removal.
What is the function of DNA polymerase and helicase?
The main function of DNA helicase is to separate two strands of DNA for replication. DNA polymerase is the main enzyme that polymerises the DNA strands during replication. DNA replication is semiconservative, one original strand is retained and one strand is newly formed in the DNA duplex.
What is elongation of DNA?
Basically, elongation is the stage when the RNA strand gets longer, thanks to the addition of new nucleotides. During elongation, RNA polymerase “walks” along one strand of DNA, known as the template strand, in the 3′ to 5′ direction.
What is catalyzed by DNA polymerase?
DNA polymerases catalyze a metal-dependent nucleotidyl transferase reaction during extension of a DNA strand using the complementary strand as a template.
Is helicase an enzyme?
Helicases are enzymes that bind and may even remodel nucleic acid or nucleic acid protein complexes. There are DNA and RNA helicases. DNA helicases are essential during DNA replication because they separate double-stranded DNA into single strands allowing each strand to be copied.
What enzyme covalently connects segments of DNA?
Replication is thermodynamically spontaneous and requires no enzymes. Its two strands are held together by easily broken covalent bonds. During DNA replication, the leading strand is synthesized continuously, whereas the lagging strand is synthesized as Okazaki fragments. Why is this so? DNA synthesis can take place only in the 5′ to 3′ direction.
Which enzyme synthesizes the lagging strand of DNA?
– DNA helicase. DNA helicase continues to separate the two parental DNA strands as the replication forks proceed from OriC clockwise and counterclockwise around the circular E. – Single-stranded DNA binding proteins (SSBPs). – DNA gyrase. – DNA primase. – The DNA polymerase III holoenzyme. – DNA polymerase I. – DNA ligase.
What enzyme uncoils DNA so it can be replicated?
What enzymes uncoils DNA so it can be replicated or copied. Helicase. What other job does this enzyme perform? Separates 2 DNA strands by breaking the weak hydrogen
Which enzyme is responsible for unzipping DNA?
Helicase (unwinds the DNA double helix)