The finding that MSH (melanocyte-stimulating hormone) causes frog skin cells to darken when added to the interstitial fluid but has no effect on color when injected into the cells supports which of the following ideas?
a. MSH is a tropic hormone.
b. MSH is a neurohormone.
c. MSH binds to cell surface receptors.
d. MSH is a steroid hormone.
e. MSH is a steroid hormone and binds to cell surface receptors.
Answer: c. MSH binds to cell surface receptors.
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