Final answer:
The cell membrane's structure, characterized by the fluid mosaic model, enables selective permeability, transport, and cell signaling.
Explanation:
Structure of Cell Membranes
The cell membrane is composed of a phospholipid bilayer with embedded proteins and carbohydrates. This arrangement forms a fluid mosaic model, where the phospholipids provide the basic structure, and proteins and carbohydrates serve various functions.
Functions of Cell Membranes
- Selective Permeability: The cell membrane controls what enters and exits the cell, allowing some substances to pass while blocking others.
- Transport: Proteins in the membrane facilitate the movement of molecules across the membrane through processes like diffusion or active transport.
- Cell Signaling: Receptor proteins on the membrane help the cell communicate with its environment and other cells.
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