10 Questions
Which of the following is NOT true about glucagon?
It inhibits glycogenolysis
In a G protein coupled receptor (GPCR):
The G protein alpha subunit is activated by binding with GTP
cAMP is crucial for regulating the action of epinephrine because:
) It activates protein kinase A (PKA)
Which out of the following statements is true about Gprotein coupled receptors?
The N-terminal chain is extracellular and C-terminal chain is intracellular
Protein kinase A is _________
Allosterically activated by cyclic AMP
Which of the following catalyses the cutting of PIP2 into IP3 and diacylglycerol in cell signalling?
) Phospholipase C
A hormone can be considered as ___________
First messenger
. Which second messenger signals the release of Ca+2 from endoplasmic reticulum?
IP3
. Glycogen phosphorylase kinase has its activity increased by
b/c
How does epinephrine release glucose so quickly?
Enzyme cascades magnify its effect
Test your knowledge of cell signalling and G protein coupled receptors with these multiple-choice questions. Determine which statements are true and false regarding glucagon, cAMP, epinephrine, protein kinase A, and PIP2 cleavage.
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