EXAM 3 BIO 172 WITH 100%
CORRECT ANSWERS 2026
You examine a muscle myosin gene in a muscle cell, a
neuropeptide gene in a neuronal cell, and a glycogen
metabolizing gene in a liver cell. What should all three genes
have in common? correct answer They should all use the same
general transcription factors at their promoters when transcribed
Which of the following is true as a result of alternative splicing?
correct answer Different mRNAs are transcribed from a single
gene
The basal transcription complex assembles at the correct answer
promoter
Regulatory transcription factors bind to correct answer
enhancers
Which of the following changes may lead to a decrease in
expression of a regulated gene? correct answer an increase in
HDAC activity
What determines which regions of the genome have acetylated
histones and which regions have histones that are not acetylated
in a skin cell? correct answer The complement of active
regulatory transcription factors in the skin cell
, Which of the following would a regulatory transcription factor
most likely recruit to a silencer? correct answer HDACS
A transcription factor bound to an enhancer may recruit a
correct answer HAT (histone acetryltransferase)
a transcription factor bound to a silencer may recruit a correct
answer HDAC (histone deacetylase)
The human body contains approximately 200 major cell types.
They look and function differently from one another because each
correct answer expresses a different set of genes
GLD-1 is an RNA binding protein which binds to the 3' UTR of the
MES-3 mRNA. If GLD-1 is not functional, MES-3 mRNA levels do
not change, but MES-3 protein levels increase. The size of the
MES-3 protein does not change, only its quantity. What is the
function of GLD-1? correct answer inhibits translation because
it is not functional here so the levels are increasing thus is
promoting translation
Which mechanism of gene regulation is used only in prokaryotes
and not in eukaryotes? correct answer Several genes acting in
the same pathway are transcribed as one polycistronic RNA
Which of the following elements of the prokaryotic lac operon
model could be considered analogous to a eukaryotic silencer?
correct answer Lac operator
CORRECT ANSWERS 2026
You examine a muscle myosin gene in a muscle cell, a
neuropeptide gene in a neuronal cell, and a glycogen
metabolizing gene in a liver cell. What should all three genes
have in common? correct answer They should all use the same
general transcription factors at their promoters when transcribed
Which of the following is true as a result of alternative splicing?
correct answer Different mRNAs are transcribed from a single
gene
The basal transcription complex assembles at the correct answer
promoter
Regulatory transcription factors bind to correct answer
enhancers
Which of the following changes may lead to a decrease in
expression of a regulated gene? correct answer an increase in
HDAC activity
What determines which regions of the genome have acetylated
histones and which regions have histones that are not acetylated
in a skin cell? correct answer The complement of active
regulatory transcription factors in the skin cell
, Which of the following would a regulatory transcription factor
most likely recruit to a silencer? correct answer HDACS
A transcription factor bound to an enhancer may recruit a
correct answer HAT (histone acetryltransferase)
a transcription factor bound to a silencer may recruit a correct
answer HDAC (histone deacetylase)
The human body contains approximately 200 major cell types.
They look and function differently from one another because each
correct answer expresses a different set of genes
GLD-1 is an RNA binding protein which binds to the 3' UTR of the
MES-3 mRNA. If GLD-1 is not functional, MES-3 mRNA levels do
not change, but MES-3 protein levels increase. The size of the
MES-3 protein does not change, only its quantity. What is the
function of GLD-1? correct answer inhibits translation because
it is not functional here so the levels are increasing thus is
promoting translation
Which mechanism of gene regulation is used only in prokaryotes
and not in eukaryotes? correct answer Several genes acting in
the same pathway are transcribed as one polycistronic RNA
Which of the following elements of the prokaryotic lac operon
model could be considered analogous to a eukaryotic silencer?
correct answer Lac operator
