What is a main difference between the modes of action of peptide hormones and steroid hormones?
A)Peptide hormones bind to intracellular receptors whereas steroid hormones bind to receptors on the cell surface.
B)Peptide hormones bind to receptors in the nucleus whereas steroid hormones bind to receptors in the cytosol.
C)Peptide hormones bind to receptors on the cell surface whereas steroid hormones act as second messengers.
D)Peptide hormones bind to receptors on the cell surface whereas steroid hormones bind to intracellular receptors.
E)There are no differences; both act by binding to receptors on the cell surface.

Question

Quizplus · Accepted Answer

The main difference between peptide hormones and steroid hormones is that peptide hormones bind to receptors on the cell surface whereas steroid hormones bind to intracellular receptors. This difference in receptor location leads to differences in their mode of action and downstream signaling pathways. Peptide hormones typically activate second messengers such as cAMP or IP3, while steroid hormones bind to DNA and alter gene transcription.

What Is a Main Difference Between the Modes of Action