Chapter 4

Question 1

Glycoproteins

Answer 1

Recognition sites , act as antigens

Question 2

Phospholipid

Answer 2

Form a bilayer, make membrane fluid.they have non polar tails and hydrophilic heads ,this form a barrier to most water soluble substances

Question 3

Cholesterol

Answer 3

Waterproof the membrane , control stability of membrane .

They also have hydrophilic heads and hydrophobic tails

Question 4

Intrinsic proteins

Answer 4

Pass through membrane , some from channels or carriers for water soluble molecules

Question 5

Extrinsic proteins

Answer 5

Found on the surface only , some act as enzymes

Question 6

Glycolipids

Answer 6

Short carbohydrate chains that help make membranes stable by forming hydrogen bonds with H2O . Help cells attach to one another

Question 7

Factors affect the permeability of a cell membrane

Answer 7

Ethanol
Heat
PH