Biology 251 - Genetics » Spring 2021 » Topic 12.2 Quiz

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Question #1
The term negative regulation refers to:
A.   use of a repressor protein.
B.   condensation of DNA into heterochromatin.
C.   switching of gene expression from on to off.
D.   switching of gene expression from on to off.
E.   use of a protein that binds to negative charges.
Question #2
Positive regulation involves:
A.   binding of an activator protein upstream of an operon's promoter.
B.   decondensation of DNA from heterochromatin to euchromatin.
C.   binding of an activator protein to an operon's operator.
D.   switching gene expression from off to on.
E.   switching of gene expression from on to off.
Question #3
A small molecule that activates gene expression by binding a regulator protein is referred to as:
A.   a corepressor.
B.   an activator.
C.   a repressor.
D.   an inducer,
E.   a coactivator.
Question #4
An end-product of a biochemical pathway that allosterically binds a repressor to cause a conformation changeto the protein-binding state functions as:
A.   an activator.
B.   a corepressor.
C.   an inducer.
D.   a repressor.
E.   a coactivator.
Question #5
Both repressor and activator proteins bind to cis regulatory elements called operators.
A.   True
B.   False

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