NEET2020Zoology-Molecular Basis of Inheritance
NEET 2020 Zoology Transcription MCQ Question
Type: MCQ-conceptual-Medium-Class 11
Name the enzyme that facilitates opening of DNA helix during transcription.
A
DNA polymerase
B
RNA polymerase
C
DNA ligase
D
DNA helicase
Correct Answer
Option B
Detailed Explanation
During transcription, RNA polymerase itself facilitates the opening (unwinding) of the DNA helix. Unlike DNA replication which uses a separate helicase enzyme, in transcription RNA polymerase has the inherent ability to unwind the DNA double helix at the transcription site to read the template strand. The correct answer is B (RNA polymerase).
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