MCAT Biochemistry Question 95: Answer and Explanation
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Question: 95
5. Enhancers are transcriptional regulatory sequences that function by enhancing the activity of:
- A. RNA polymerase at a single promoter site.
- B. RNA polymerase at multiple promoter sites.
- C. spliceosomes and lariat formation in the ribosome.
- D. transcription factors that bind to the promoter but not to RNA polymerase.
Correct Answer: A
Explanation:
Specific transcription factors bind to a specific DNA sequence, such as an enhancer, and to RNA polymerase at a single promoter sequence. They enable the RNA polymerase to transcribe the specific gene for that enhancer more efficiently.