Regulation of Gene Expression

AP Biology· difficulty 3/5

activator RNA pol II enhancer promoter

A loss-of-function mutation in the activator's DNA-binding domain would most likely cause:

  • A

    Translation of an unrelated mRNA.

  • B

    Increased transcription via positive feedback.

  • C

    Decreased transcription of target genes due to failure of activator recruitment.

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  • D

    No change in transcription.

Explanation

If the activator cannot bind the enhancer, it cannot recruit/coactivate RNA Pol II at the promoter, decreasing transcription of its target genes.

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