Question

1. explain how the cell membrane functions as a regulatory structure and protective barrier.

Explanation:

The cell membrane is a phospholipid - bilayer with embedded proteins. As a regulatory structure, it controls the movement of substances in and out of the cell through processes like diffusion, facilitated diffusion, and active transport. As a protective barrier, it separates the cell's internal environment from the external one, preventing harmful substances from entering and maintaining cell integrity.

Answer:

The cell membrane functions as a regulatory structure by controlling substance movement via diffusion, facilitated diffusion, and active transport. It acts as a protective barrier by separating the cell's internal and external environments and maintaining cell integrity.