Multiple Choice
In prokaryotic cells, control of gene expression primarily occurs at which level?
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16. Regulation of Expression
Prokaryotic Gene Regulation via Operons
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Which of the following best describes the function of an operator in a prokaryotic operon?
A
A protein that increases the rate of transcription by binding to DNA
B
A DNA sequence where a repressor protein can bind to regulate transcription
C
A segment of DNA that codes for a repressor protein
D
An enzyme that synthesizes RNA from a DNA template
Verified step by step guidance1
Understand the concept of a prokaryotic operon: An operon is a cluster of genes under the control of a single promoter and regulatory elements, allowing coordinated regulation of gene expression in prokaryotes.
Identify the role of the operator: The operator is a specific DNA sequence within the operon that acts as a regulatory element. It serves as a binding site for repressor proteins.
Clarify the function of a repressor protein: A repressor protein binds to the operator to block RNA polymerase from transcribing the genes in the operon, effectively regulating transcription.
Eliminate incorrect options: Review each option and determine whether it accurately describes the operator. For example, the operator is not a protein, does not code for a repressor, and is not an enzyme.
Select the correct answer: Based on the explanation, the operator is best described as 'A DNA sequence where a repressor protein can bind to regulate transcription.'
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