Which type of hormone releases cyclic AMP as a second messenger?
A) Peptide only
B) Steroid only
C) Protein only
D) Peptide and protein only
E) peptide, steroid, and protein

Question

Which type of hormone releases cyclic AMP as a second messenger?  
A) Peptide only
B) Steroid only
C) Protein only
D) Peptide and protein only
E) peptide, steroid, and protein

Quizplus · Accepted Answer

Peptides and proteins are able to release cyclic AMP as a second messenger as they are unable to pass through the cell membrane and therefore require a signaling pathway to reach the cell interior. Steroids are able to diffuse across the cell membrane and directly bind to intracellular receptors without the need for a second messenger.

Which Type of Hormone Releases Cyclic AMP as a Second