Question

1. Which of the following is the primary component that makes up the cell membrane?

A.) carbohydrates

B.) nucleic acids

C.) proteins

D.) phospholipids

Answer 1

Plasma membrane is the outer covering of cell made up of the phospholipid bilayer. Chemically, cell membrane or plasma membrane is composed of proteins (20 - 70 %), lipids (20 - 79 %), carbohydrates (1 - 5 %) and water (20 %). Nucleic acids, i.e., DNA and RNA are absent. Thus, the correct answer is option D.