Regulation of Gene Expression

AP Biology· difficulty 3/5

In prokaryotic operons, the operator is

A
$A short DNA sequence near the promoter where a repressor binds$
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B
$A ribosome binding site upstream of the start codon on bacterial mRNAs$
C
$A regulatory protein that binds DNA to block RNA polymerase recruitment$
D
$An mRNA segment near the start codon that controls ribosome attachment$

Explanation

Repressor binding to the operator physically blocks RNA polymerase from transcribing the operon's structural genes.

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