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Standard XII
Biology
Transcription
Question

Name the enzyme that facilitates opening of DNA helix during transcription.

A
DNA polymerase
B
RNA polymerase
C
DNA helicase
D
DNA ligase
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Solution
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Correct option is A. DNA helicase
  • During transcription of the DNA, RNA polymerase complex helps in the unwinding of DNA helix that is going to be transcribed.
  • DNA helicase helps in the unwinding of DNA helix during DNA replicaiton.
  • DNA polymerase helps in the synthesis of DNA strands during DNA replication.
  • DNA ligase is enzyme used for the joining of the DNA strands.
  • So, the correct answer is (A).

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Similar Questions
Q1
Name the enzyme that facilitates opening of DNA helix during transcription.
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Q2
Name the enzyme that facilitates opening of DNA helix during DNA replication.
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Q3
Which of the following enzyme of transcription helps in opening of DNA helix as well as transcribing it?
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Q4
Read the following statements regarding transcription.
1. RNA polymerase initiates the process of transcription with the help of sigma factor.
2. RNA polymerase also facilitates opening of the DNA double helix in prokaryotes.
3. Transcription requires primer
4. In bacteria, there are three types of RNA polymerases.
How many of the above statements are incorrect?
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Q5
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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