Question

1. molecules in the cell membrane that function as receptors are

a. proteins.
b. glycerol.
c. cholesterol.
d. phospholipids.

Explanation:

Cell membrane receptors are proteins. Proteins in the cell membrane can act as receptors to bind specific molecules (such as hormones, neurotransmitters etc.) and initiate intracellular signaling pathways. Glycerol is a component of some lipids (like triglycerides). Cholesterol is a lipid that is part of the cell membrane but its main functions are related to membrane fluidity etc. Phospholipids form the basic bilayer structure of the cell membrane.

Answer:

A. proteins