Explore topic-wise MCQs in Cell Biology.

This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Cell Biology knowledge and support exam preparation. Choose a topic below to get started.

1.

The posttranslational modification involving nitric oxide is called __________________

A. N-nitrosylation
B. P-nitrosylation
C. N-glycosylation
D. S-nitrosylation
Answer» E.
Discussion
2.

Viagra is specific for which isoform of cGMP phosphodiesterase?

A. PDE2
B. PDE4
C. PDE5
D. PDE8
Answer» D. PDE8
Discussion
3.

The development of Viagra is related to the discovery of nitric oxide as a ____________________

A. secondary messenger
B. gaseous compound
C. primary messenger
D. cyclin inhibitor
Answer» B. gaseous compound
Discussion
4.

Which of the following compounds is metabolized into nitric oxide?

A. Phosphoglycerine
B. Nitroglycerine
C. Sulforaphane
D. Serotonin
Answer» C. Sulforaphane
Discussion
5.

The nitric oxide binds to and stimulates guanylyl cyclase.

A. True
B. False
Answer» B. False
Discussion
6.

Binding of acetylcholine to outer surface of endothelial cells, signals _____________________

A. increase in cytosolic Ca<sup>2+</sup> concentration
B. decrease cytosolic Ca<sup>2+</sup> concentration
C. increase in acidity
D. increase in basicity
Answer» B. decrease cytosolic Ca<sup>2+</sup> concentration
Discussion
7.

The diffusible agent produced by binding of acetylcholine to endothelial cells is __________________

A. vimentin
B. nitric oxide
C. hydrogen peroxide
D. hydrogen sulfide
Answer» C. hydrogen peroxide
Discussion
8.

Acetylcholine has the function of ________________________

A. muscle relaxation
B. fertilizing agent
C. promoting cell adhesion
D. promoting cell division
Answer» B. fertilizing agent
Discussion
9.

Nitric oxide is formed from which of the amino acid?

A. L-lysine
B. R-lysine
C. R-arginine
D. L-arginine
Answer» E.
Discussion
10.

Nitric oxide is an intracellular messenger.

A. True
B. False
Answer» B. False
Discussion