Cell membranes

Question 1

Cell membrane - job

Answer 1

Cell membranes act as barriers and can control what passes into and out of cells and organelles

Question 2

What is the cell membrane comprised of?

Answer 2

composed of phospholipids, proteins, glycoproteins, glycolipids and cholesterol.

Question 3

Glycolipids and glycoproteins - job on membranes

Answer 3

allow cell adherence, stability and act as recognition sites

Question 4

Cholesterol - job on membranes

Answer 4

has a hydrophilic end and a hydrophobic end &regulates membrane fluidity by intercalating between the phospholipids.

Question 5

Phospholipid bilayers and temperature

Answer 5

high temperatures the phospholipid bilayer increases its fluidity and permeability, increasing the risk of the proteins becoming denatured. At low temperatures, the phospholipids are compressed, making the membrane stif

Question 6

Phospholipid bilayers and Organic solvents

Answer 6

Organic solvents disrupt the bilayer and dissolve the membrane

Question 7

Phospholipid membrane diagram

Answer 7

see photo