NEET 2020 Botany Transcription MCQ Question
Name the enzyme that facilitates opening of DNA helix during transcription.
DNA polymerase
RNA polymerase
DNA ligase
DNA helicase
Correct Answer
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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