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Set 2 8 Cell Signaling

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Question 1

(Multiple Choice)

Free
Increase in IP3 levels is associate with

A) Gs mechanims
B) Gi mechanisms
C) Gq mechanisms
D) Go mechanisms
E) A and C are correct

Answer

Question 2

(Multiple Choice)

Free
The function of PKA in G smechanisms is to

A) Alter the activity of target proteins by phosphorylating them at serine or threonine residues
B) Synthesize cAMP from ATP
C) Degrade cAMP
D) Activate proteins by directly binding to them
E) Catalyze the re-association of the α\alpha and β\beta Ƴ subunits

Answer

Question 3

(Multiple Choice)

Free
The signaling mechanism that converts an electrical signal on the surface of the cell to a Ca2+ signal inside the cell is which of the following?

A) Ligand-gated channels (especially glutamate receptors)
B) Ryanodine receptors
C) IP3 receptors
D) Voltage-gated Ca2+ channels
E) Calmodulin-dependent protein kinase

Answer