Cell membrane structure and function

How thick is the cell membrane

7nm

Roles of the cell membrane

1. Controls movement of substances into and out of the cell
   E.g. Nutrients, waste products

2. Semi-permeable
   Barrier to water-soluble substances (because of the hydrophobic core)
   Allows passage of lipid soluble substances.

3. Cell signalling

4. Cell recognition

5. Cell-to-cell adhesion

6. Site for enzymes to catalyse reactions

7. Anchoring for the cytoskeleton

8. Form H bonds with water for stability

What is a fluid mosaic model?

Phospholipids and protein molecules are able to move about and diffuse sideways within its monolayer (fluid) and the proteins are interspersed / scattered within membrane (mosaic)

Components of the Plasma Membrane

1. Phospholipids

2. Cholesterol

3. Proteins

4. Glycolipids (carbs + lipids/fats)

5. Glycoproteins (carbs + proteins)