1 Cells - Cell Membranes

Question 1

What is the main component of a plasma membrane?

Answer 1

The phospholipid bilayer.

Question 2

What are the different types of proteins in a plasma membrane?

Answer 2

• Peripheral proteins
• Intrinsic Proteins

Question 3

What are the different types of carbohydrates in a plasma membrane?

Answer 3

• Glycolipids
• Glycoproteins

Question 4

What are all the components of a plasma membrane?

Answer 4

• Phospholipid bilayer
• Intrinsic proteins
• Peripheral proteins
• Glycolipids
• Glycoproteins
• Cholesterol

Question 5

function of the phospholipid bilayer

Answer 5

• Form a barrier to dissolved substances.
• Center is fatty acids which are hydrophobic, water soluble
  substances can’t pass through (ions + polar molecules)
  -Allows lipid soluble molecules to pass through (non-polar and small) e.g- CO₂ is able to diffuse across the membrane.

Question 6

function of a intrinsic protein

Answer 6

• Channel proteins and carrier proteins allow
  = large molecules
  = polar molecules
  = ions
  to pass through the membrane

Question 7

function of a peripheral protein

Answer 7

• act as receptors, allowing cell to detect chemicals released from other cells so they are able to respond

Question 8

function of a glycoprotein

Answer 8

• proteins with a carbohydrate attached
• recognise other cells as familiar or foreign
• cell adhesion to form tissue

Question 9

function of a glycolipid

Answer 9

• proteins with a lipid attached
• cell recognition
• cell adhesion to form tissue

Question 10

What can glycolipids and glycoproteins be classed as?

Answer 10

• Antigens, this is due to their contribution in immune response as they facilitate cellular recognition.

Question 11

function of cholesterol