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