1. What is the primary function of the cell membrane?

A) To synthesize proteins

B) To store genetic material

C) To regulate the passage of substances in and out of the cell

D) To produce ATP

Answer: C

Explanation: The cell membrane, or plasma membrane, acts as a selective barrier.

It controls the movement of ions, nutrients, and waste products between the

cell's interior and the external environment. While the membrane is involved in

cell signaling and recognition, its prima...
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