A. Enzymes
B. Phospholipids
C. Cholesterol
D. Proteins
Answer
Correct Answer: D. Proteins
Detail about Mcqs
The correct answer is:
D. Proteins
Explanation:
The selective permeability of the cell membrane is primarily due to the presence of proteins embedded in the lipid bilayer. These membrane proteins function as channels, carriers, or pumps to allow specific substances to pass through the membrane, while blocking others.
Transport proteins play a crucial role in regulating the movement of ions, nutrients, and waste products across the membrane.