Which statement about nitric oxide is true?
A) Because it is chemically stable, it is able to travel relatively long distances.
B) It does not diffuse readily.
C) It is made in the body from arginine.
D) The enzyme that catalyzes the formation of nitric oxide is inhibited by calcium ions.
E) It is produced by inactivation of NO synthase.

Question

Quizplus · Accepted Answer

Nitric oxide is produced in the body from arginine by the action of the enzyme nitric oxide synthase. This process releases nitric oxide molecules which act as a signaling molecule in various physiological processes.

(Note: The other options are all incorrect. Nitric oxide is not chemically stable and quickly reacts with other molecules in the body. It diffuses readily, as its small size allows it to cross membranes easily. The enzyme that catalyzes its formation, nitric oxide synthase, is actually activated by calcium ions. It is not produced by inactivation of NO synthase).

Which Statement About Nitric Oxide Is True