A receptor on the cell surface usually has several domains. What is the function of the external domain?
A) It functions as an enzyme.
B) It attaches the receptor to the DNA.
C) It holds the receptor within the membrane.
D) It transmits the signal to the inside of the cell.
E) It is the docking site for a signaling molecule.

Question

Quizplus · Accepted Answer

The external domain of a cell surface receptor is typically involved in binding to signaling molecules (ligands) that are present outside the cell. This interaction is crucial for the initiation of signal transduction pathways that convey messages into the cell.

A Receptor on the Cell Surface Usually Has Several Domains