What is the initial step in G protein signaling?
Adenylate Cyclase Mechanism - Inorganic Pyrophosphatase Mechanism

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Science, Chemistry, Biology
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Hydrolysis of ATP
Release of cyclic AMP
Activation of adenylyl cyclase
Binding of a neurotransmitter to a G protein-coupled receptor
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does adenylyl cyclase convert ATP into?
GTP
Protein kinase A
Cyclic AMP and inorganic pyrophosphate
Inorganic phosphate
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is the reaction catalyzed by adenylyl cyclase considered exergonic?
It forms a stable intermediate
It decreases entropy
It releases free energy
It requires energy input
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What role do magnesium ions play in the mechanism of adenylyl cyclase?
They are not involved
They act as a catalyst
They stabilize the intermediate
They are part of the substrate
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is formed during the mechanism of adenylyl cyclase?
A linear intermediate
A trigonal bipyramidal intermediate
A tetrahedral intermediate
A square planar intermediate
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of cyclic AMP in the cell?
It degrades proteins
It activates protein kinase A
It synthesizes ATP
It inhibits protein kinase A
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does cyclic AMP affect protein kinase A?
It binds to the catalytic subunit
It degrades the catalytic subunit
It inhibits the regulatory subunit
It releases the regulatory subunit
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