key term - Fluid mosaic model

Definition

The fluid mosaic model describes the structure of cell membranes, depicting them as a dynamic arrangement of phospholipids and proteins. This model emphasizes the fluid nature of the lipid bilayer and the diverse, mosaic-like distribution of proteins within it.

5 Must Know Facts For Your Next Test

1. The lipid bilayer is composed mainly of phospholipids, which allow for fluidity and flexibility.
2. Proteins embedded in the membrane can move laterally but rarely flip-flop across the bilayer.
3. Cholesterol molecules within the membrane help to stabilize its fluidity across various temperatures.
4. Integral proteins span the entire membrane, while peripheral proteins are attached to either the inner or outer surface.
5. Carbohydrates attached to lipids (glycolipids) or proteins (glycoproteins) play key roles in cell recognition and signaling.

Review Questions

Related terms

Phospholipid Bilayer: Composed of two layers of phospholipids with hydrophilic heads facing outward and hydrophobic tails inward.

Integral Proteins: Proteins that are permanently embedded within the plasma membrane.

Glycoproteins: Proteins that have carbohydrate groups attached to them, playing crucial roles in cell-cell interactions.