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Standard XII
Biology
Transcription Unit
Question

In DNA replication, the primer is
  1. A small ribonucleotide polymer.
  2. Enzyme taking part in joining nucleotides of new strand.
  3. Helix destabilizing protein.
  4. A small deoxyribonucleotide polymer.

A
A small deoxyribonucleotide polymer.
B
A small ribonucleotide polymer.
C
Helix destabilizing protein.
D
Enzyme taking part in joining nucleotides of new strand.
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Solution
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DNA replication is the process of producing two identical replicas from one original DNA molecule. This biological process occurs in all living organisms and is the basis for biological inheritance.
Well, a primer is a short polynucleotide segment that primes, or prepares, the way for DNA replication by helping DNA polymerase to get started in doing its job. The primer is made out of RNA, so it's called an RNA primer.

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Similar Questions
Q1

Match the following enzymes of DNA replication with their respective functions:
p. DNA polymerasei. Helps unzip the DNA double helixq. DNA ligaseii. Seals nicks between Okazaki fragmentsr. DNA helicaseiii. Lays RNA primers to which polymerase can add nucleotidess. Primaseiv. Adds nucleotides to the free 3′ end of RNA primers


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Q2
How many of the following statements are correct ?

A. DNA dependent DNA polymerase requires DNA primer for initiating replication but DNA dependent RNA polymerase does not require any primer for transcription.

B. DNA dependent DNA polymerase requires RNA primer for initiating replication but DNA dependent RNA polymerase does not require any primer for transcription.

C. During replication, unwinding of DNA double helix forms a fork-like structure called replication fork.

D. During transcription, unwinding of the DNA double helix by DNA dependent RNA polymerase forms a transcription bubble.

E. During transcription, unwinding of DNA double helix by DNA dependent RNA polymerase forms a transcription fork.
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Q3

Match the following enzymes of DNA replication with their respective functions:

p. DNA polymerase i. Helps unzip the DNA double helix

q. DNA ligase ii. Seals nicks between Okazaki fragments

r. DNA helicase iii. Lays RNA primers to which polymerase can add nucleotides

s. Primase iv. Adds nucleotides to the free 3’ end of RNA primers


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Q4
Which enzyme catalyzes the separation of DNA strands during DNA replication?
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Q5
Protein helping in opening of DNA double helix in front of replication fork is
a. DNA gyrase
b. DNA polymerase 1
c. DNA Ligase
d. DNA topoisomerase
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