Protein Synthesis — Quiz

Question 9 • Biology

Which describes a promoter?

Answer

the part of an operon that, if attached by a repressor protein, suppresses the expression of a gene

an enzyme that helps DNA unzip prior to transcription

a cluster of genes that are expressed or repressed as a group

the first part of an operon that regulates where, when, and to what level a gene is expressed

Explanation

A promoter is a DNA sequence where RNA polymerase binds to begin transcription. Its location helps regulate whether and how strongly the genes in an operon are transcribed. Choice D describes this regulatory starting region; choice A instead describes an operator, which can bind a repressor.

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