Both insulin and glucagon are peptide hormones that target liver cells. The responses of the target cells to these two hormones are exactly the opposite of each other. This information implies that
A) each of the two hormones uses a different second messenger.
B) one of the hormones does not interact with a membrane receptor.
C) both hormones interact with receptors at the cell nucleus.
D) one hormone binds to a receptor on the cell membrane and the other to an intracellular receptor.
A) each of the two hormones uses a different second messenger.
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