BIO 93 Week 7: Cell Bio Exam Questions and
Answers with Verified Solutions | Latest
Updated 2026
31-1 Which of the following A. Cleavage of PIP2 produces two
statements is false? (you might independent
have hydrophobic second messengers.
to do some Googling to complete
this question)
A. Cleavage of PIP2 produces two
independent hydrophobic second
messengers.
B. Viagra is an inhibitor of cGMP
phosphodiesterase, which can
affect
vision.
C. IP3 can be phosphorylated to
produce IP4.
D. Ca2+ and DAG each bind to
and
help activate PKC.
E. Diacylglycerol (DAG) can
translocate in the inner leaflet of
the
lipid bilayer.
,31-2 Which of the following directly D. DAG
helps PKC phosphorylate cytosolic
proteins located close to the
plasma
membrane?
A. IP4
B. Orai channels
C. PIP2
D. DAG
E. GPCR
31-3 Which of the following is a B. Adding a phosphate to IP3
mechanism that helps to end
an IP3-mediated Ca2+ response?
A. Delaying phosphorylation of IP3
B. Adding a phosphate to IP3
C. Converting IP3 to DAG
D. Pumping Ca2+ into the
cytoplasm.
E. Increasing synthesis of PIP2.
ALS 18 Which of the following are B. 1 and 2 only.
direct targets of activated trimeric
G-
proteins?
,ALS 18 Which of the following C. 1,2-Diacylglycerol
molecules is an example of a
commonly usedhydrophobic
second
messenger?
A. Inositol 1,4,5 triphosphate
B. Adenylyl cyclase
C. 1,2-Diacylglycerol
D. Cyclic adenosine
monophosphate.
E. Phosphatidylinositol 4,5
bisphosphate.
ALS 18 Stimulation of cells in a D. A, B and C each contribute to the shape
tissue of slope
culture dish with epinephrine- what 's'.
contributes to the shape of the
slope
“s”?
A. The rate of dissociation of the
ligand from the GPCR.
B. The amount of cytosolic cAMP
phosphodiesterase activity.
C. How much GAP activity is
produced by the activated
adenylylcyclase.
D. A, B and C each contribute to
the
shape of slope ‘s’.
, ALS 18 Stimulation of cells in a C. The GPCR is becoming desensitized.
tissue
culture dish with epinephrine- why
does [cAMP] decrease with time?
A. The Gas subunit is being
degraded.
B. cAMP phosphodiesterase
(PDE)
activity becomes decreased.
C. The GPCR is becoming
desensitized.
D. The cytosolic ATP
concentration
becomes depleted (reduced)with
prolonged stimulation.
E. Adenylyl cyclase (AC) is being
degraded.
Answers with Verified Solutions | Latest
Updated 2026
31-1 Which of the following A. Cleavage of PIP2 produces two
statements is false? (you might independent
have hydrophobic second messengers.
to do some Googling to complete
this question)
A. Cleavage of PIP2 produces two
independent hydrophobic second
messengers.
B. Viagra is an inhibitor of cGMP
phosphodiesterase, which can
affect
vision.
C. IP3 can be phosphorylated to
produce IP4.
D. Ca2+ and DAG each bind to
and
help activate PKC.
E. Diacylglycerol (DAG) can
translocate in the inner leaflet of
the
lipid bilayer.
,31-2 Which of the following directly D. DAG
helps PKC phosphorylate cytosolic
proteins located close to the
plasma
membrane?
A. IP4
B. Orai channels
C. PIP2
D. DAG
E. GPCR
31-3 Which of the following is a B. Adding a phosphate to IP3
mechanism that helps to end
an IP3-mediated Ca2+ response?
A. Delaying phosphorylation of IP3
B. Adding a phosphate to IP3
C. Converting IP3 to DAG
D. Pumping Ca2+ into the
cytoplasm.
E. Increasing synthesis of PIP2.
ALS 18 Which of the following are B. 1 and 2 only.
direct targets of activated trimeric
G-
proteins?
,ALS 18 Which of the following C. 1,2-Diacylglycerol
molecules is an example of a
commonly usedhydrophobic
second
messenger?
A. Inositol 1,4,5 triphosphate
B. Adenylyl cyclase
C. 1,2-Diacylglycerol
D. Cyclic adenosine
monophosphate.
E. Phosphatidylinositol 4,5
bisphosphate.
ALS 18 Stimulation of cells in a D. A, B and C each contribute to the shape
tissue of slope
culture dish with epinephrine- what 's'.
contributes to the shape of the
slope
“s”?
A. The rate of dissociation of the
ligand from the GPCR.
B. The amount of cytosolic cAMP
phosphodiesterase activity.
C. How much GAP activity is
produced by the activated
adenylylcyclase.
D. A, B and C each contribute to
the
shape of slope ‘s’.
, ALS 18 Stimulation of cells in a C. The GPCR is becoming desensitized.
tissue
culture dish with epinephrine- why
does [cAMP] decrease with time?
A. The Gas subunit is being
degraded.
B. cAMP phosphodiesterase
(PDE)
activity becomes decreased.
C. The GPCR is becoming
desensitized.
D. The cytosolic ATP
concentration
becomes depleted (reduced)with
prolonged stimulation.
E. Adenylyl cyclase (AC) is being
degraded.
