Question

Using your knowledge of the fluid mosaic model, explain how the membrane acts as a barrier to water-soluble molecules.​

Answer 1

The outer hydrophilic surfaces allow membranes to be soluble in water, whereas the inner hydrophobic layer inhibits the passage of most water-soluble chemicals and molecules. ... The tight packing of phospholipids in a membrane prevents larger molecules (amino acids, carbohydrates) from diffusing across.