Transcription bubble:
Correct answer: D. GC + AT base pairs
- A. U ribonucleotide
- B. Core enzyme
- C. Sigma factor
- D. GC + AT base pairs
Explanation
The transcription bubble forms during transcription, where the DNA double helix temporarily unwinds, creating a single-stranded template for RNA synthesis. Within this bubble, the exposed bases on the DNA template strand (containing both GC and AT base pairs) serve as a template for complementary base pairing with incoming ribonucleotides, ultimately determining the sequence of the newly synthesized RNA transcript.
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