Discussion
Membrane proteins that act as receptors typically
Answer: A
Correct answer: bind a signal molecule on the outer face
A receptor is a transmembrane protein whose extracellular domain binds its ligand and whose intracellular domain then changes shape or activity, passing the message inward without the signal molecule itself ever entering the cell. That is what makes the cell responsive to its surroundings, and it is why the response depends on the receiving cell rather than on the signal.
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