UH LIN/DAANE GENETICS EXAM 3
QUESTIONS |GUARANTEED PASS!!!
1.) In bacterial inducible gene regulation, a small molecule inducer binds
to a repressor and...
A) prevents it from binding to DNA.
B) helps it bind to DNA.
C) inhibits gene transcription.
D) prevents RNA polymerase from binding to the promoter.
E) increases its binding to cAMP. - ACCURATE ANSWERS✔✔ A)
prevents it from binding to DNA.
2.) Which of the following is NOT a mechanism of gene regulation in
bacteria?
A) Regulatory proteins can bind to DNA and decrease transcription.
B) Proteins or RNAs can bind to mRNA and prevent translation.
C) Modifications of their protein products can alter their functions.
D) Regulatory proteins can bind to DNA and increase transcription.
E) 5' capping of RNA can regulate their stability and translation. -
ACCURATE ANSWERS✔✔ E) 5' capping of RNA can regulate their
stability and translation.
,3.) *For a repressible gene in bacteria, the binding of a small molecule
corepressor to a repressor...
A) prevents it from binding to DNA.
B) helps it bind to DNA.
C) inhibits gene transcription.
D) prevents RNA polymerase from binding to the promoter.
E) two of the above - ACCURATE ANSWERS✔✔ E) two of the above
4.) What type of molecule is the lac repressor?
A) DNA
B) RNA
C) Protein
D) Sugar
E) Lipid - ACCURATE ANSWERS✔✔ C) Protein
5.) What type of molecule is the lac operator?
A) DNA
B) RNA
C) Protein
D) Sugar
E) Lipid - ACCURATE ANSWERS✔✔ A) DNA
, 6.) Which small molecule functions as the inducer which binds the lac
repressor in the regulation of the lac operon?
A) cAMP.
B) GTP
C) ATP
D) Galactose
E) Allolactose - ACCURATE ANSWERS✔✔ E) Allolactose
7.) How does glucose play a role in regulating the lac operon?
A) High glucose increases intracellular cAMP levels and activates CAP.
B) High glucose decreases intracellular cAMP levels and activates CAP.
C) Low glucose increases intracellular cAMP levels and activates CAP.
D) Low glucose decreases intracellular cAMP levels and activates CAP.
E) None of the above. - ACCURATE ANSWERS✔✔ C) Low glucose
increases intracellular cAMP levels and activates CAP.
8.) Under which of the following conditions will the lac operon have the
highest expression?
A) Glucose present, lactose absent
B) Glucose present, lactose present
C) Glucose absent, lactose absent
D) Glucose absent, lactose present
QUESTIONS |GUARANTEED PASS!!!
1.) In bacterial inducible gene regulation, a small molecule inducer binds
to a repressor and...
A) prevents it from binding to DNA.
B) helps it bind to DNA.
C) inhibits gene transcription.
D) prevents RNA polymerase from binding to the promoter.
E) increases its binding to cAMP. - ACCURATE ANSWERS✔✔ A)
prevents it from binding to DNA.
2.) Which of the following is NOT a mechanism of gene regulation in
bacteria?
A) Regulatory proteins can bind to DNA and decrease transcription.
B) Proteins or RNAs can bind to mRNA and prevent translation.
C) Modifications of their protein products can alter their functions.
D) Regulatory proteins can bind to DNA and increase transcription.
E) 5' capping of RNA can regulate their stability and translation. -
ACCURATE ANSWERS✔✔ E) 5' capping of RNA can regulate their
stability and translation.
,3.) *For a repressible gene in bacteria, the binding of a small molecule
corepressor to a repressor...
A) prevents it from binding to DNA.
B) helps it bind to DNA.
C) inhibits gene transcription.
D) prevents RNA polymerase from binding to the promoter.
E) two of the above - ACCURATE ANSWERS✔✔ E) two of the above
4.) What type of molecule is the lac repressor?
A) DNA
B) RNA
C) Protein
D) Sugar
E) Lipid - ACCURATE ANSWERS✔✔ C) Protein
5.) What type of molecule is the lac operator?
A) DNA
B) RNA
C) Protein
D) Sugar
E) Lipid - ACCURATE ANSWERS✔✔ A) DNA
, 6.) Which small molecule functions as the inducer which binds the lac
repressor in the regulation of the lac operon?
A) cAMP.
B) GTP
C) ATP
D) Galactose
E) Allolactose - ACCURATE ANSWERS✔✔ E) Allolactose
7.) How does glucose play a role in regulating the lac operon?
A) High glucose increases intracellular cAMP levels and activates CAP.
B) High glucose decreases intracellular cAMP levels and activates CAP.
C) Low glucose increases intracellular cAMP levels and activates CAP.
D) Low glucose decreases intracellular cAMP levels and activates CAP.
E) None of the above. - ACCURATE ANSWERS✔✔ C) Low glucose
increases intracellular cAMP levels and activates CAP.
8.) Under which of the following conditions will the lac operon have the
highest expression?
A) Glucose present, lactose absent
B) Glucose present, lactose present
C) Glucose absent, lactose absent
D) Glucose absent, lactose present
