Cells that respond to peptide hormones usually do so through a sequence of biochemical reactions involving receptor and kinase activation.In order for cells to respond,it is necessary for first and second messengers to communicate.This is possible because ________.
A) peptide hormones are converted by cell membranes enzymes into second messengers
B) G protein acts as the link between first and second messengers
C) the hormone receptor complex moves into the cytoplasm as a unit
D) hormones alter cellular operations through direct stimulation of a gene

Question

Quizplus · Accepted Answer

G proteins act as intermediaries between the first messenger (the hormone) and the second messenger (such as cAMP or calcium ions) in the signaling pathway. When a peptide hormone binds to its receptor, it activates a G protein, which in turn activates a signaling pathway leading to a cellular response. This allows for rapid and specific cellular responses to the hormone signal.

Cells That Respond to Peptide Hormones Usually Do So Through