Question
Asked Dec 2, 2019
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When taken up by a cell, which of the following molecules binds to a repressor so that the repressor no longer binds to the operator?

a) inducer

b) promoter

c) repressor

d) corepressor

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Expert Answer

Step 1

In the subject of molecular biology, an inducer is a molecule that regulates gene expression. An inducer can bind to protein repressors or activators.

Binding with activator leads to the gene expression whereas, binding with the repressor prevents the initiation of gene expression.

A promoter is a region of DNA where transcription of a gene is initiated. It is a sequence within the DNA fragment.

A repressor is a protein that binds to a short specific DNA sequence and controls the expression of a gene or operon.

Step 2

Reasons for correct answers

A repressor is a negative regulatory protein. It binds to the operator region of a promoter and thereby negatively influences the ability of RNA polymerase to transcribe the gene or operon. 

A repressor can also bind to a small molecule, which is called an effector. There are two types of effectors. One type is called an inducer and the other is corepressor.

When an inducer is bound to its repress...

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Biology

Molecular Biology

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