Explain the types of proteins found in cell membrane. Who gave fluid mosaic model of plasma membrane?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Membrane proteins:
|
Type |
Characteristics |
Functions |
|
Integral (Intrinsic) |
Embedded in lipid bilayer; amphipathic; may span entire membrane (transmembrane proteins) |
Transport (channels, carriers), receptors, cell adhesion |
|
Peripheral (Extrinsic) |
Loosely attached to membrane surface; interact with polar heads or integral proteins |
Enzymatic activity, cell signaling, cytoskeletal anchoring |
Fluid Mosaic Model: Proposed by S. Jonathan Singer and Garth L. Nicolson (1972)
Key features:
- Lipid bilayer is fluid (lipids and proteins move laterally)
- Proteins form a mosaic pattern within/on lipid matrix
- Explains membrane dynamics, selective permeability, and receptor function
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