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Which describes a promoter?
a. the first part of an operon that regulates where, when, and to what level a gene is expressed
b. the part of an operon that, if attached by a repressor protein, suppresses the expression of a gene
c. a cluster of genes that are expressed or repressed as a group
d. an enzyme that helps DNA unzip prior to transcription.

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Answer:

Explanation:

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

Promotor is the part of an operon that, if attached by a repressor protein, suppresses the expression of a gene. thus option B is correct

What is operon?

An operon is a group of genes that are transcribed together to produce a single messenger RNA (mRNA) molecule that codes for numerous proteins.

A promoter, as related to genomics, is a region of DNA upstream of a gene where relevant proteins (such as RNA polymerase and transcription factors) bind to initiate transcription of that gene. The resulting transcription produces an RNA molecule (such as mRNA).thus, option B is correct.

Learn more about operon here:

https://brainly.com/question/13981976

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