Which of the following statements best describes a typical cAMP-mediated signal transduction event?
A) The second messenger is the last part of the system to be activated.
B) A hormone activates the second messenger by directly binding to it.
C) The second messenger amplifies the hormonal response by attracting more hormones to the cell being affected.
D) Adenylyl cyclase is activated after the hormone binds to the cell and before phosphorylation of proteins occurs.

Question

Quizplus · Accepted Answer

Adenylyl cyclase is activated after a hormone binds to a receptor on the cell surface. This enzyme then converts ATP to cyclic AMP (cAMP), which acts as a second messenger to activate other proteins in the cell, leading to a cascade of events including the phosphorylation of proteins. This process does not involve hormones directly binding to the second messenger or the second messenger attracting more hormones. The second messenger is not the last part of the system to be activated; it plays a role early in the signal transduction pathway to amplify the signal.

Which of the Following Statements Best Describes a Typical CAMP-Mediated