A second messenger is: a. a molecule that allows one cell to communicate with other cells b. a chemical messenger released from synaptic terminals across synapses c. a molecule that intiates a signaling cascade in response to hormone binding on a cell membrane receptor and activating a G protein. d. a hormone that binds to a cell membrane hormone receptor and triggers activation of another messenger system.
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Correct answer is C .
A second messenger is a molecule that intiates a signaling cascade in response to hormone binding on a cell membrane receptor and activating a G protein.