Which of the following are true of the second messenger signaling system?
1)This system requires the availability of energy in the form of ATP.
2)This system is utilized by steroid and peptide hormones.
3)An example of a second messenger is cyclic-AMP.

Question

Quizplus · Accepted Answer

The second messenger signaling system indeed requires ATP, as it is often used in the process of converting primary signals into secondary ones, such as the conversion of ATP to cyclic-AMP (cAMP). Steroid hormones, however, typically do not utilize second messenger systems; they usually pass directly through the cell membrane and act on intracellular receptors, contrasting with peptide hormones that often do use second messenger systems.

Which of the Following Are True of the Second Messenger