Membrane Proteins:

Question 1

What 2 categories can we divide membrane proteins into?

Answer 1

= instrinsic- integral proteins
= extrinsic- peripheral proteins
=

Question 2

What are instrinsic proteins?

Answer 2

= fully embedded into the membrane from one side to the other
= pass through the lipid bilayer- have hydrophobic amino acids on the outside surface of the protein
= can interact with the hydrophobic fatty acids tails in the phospholipid

Question 3

What are the 2 types of instrinsic proteins?

Answer 3

= protein channel
= carrier protein

Question 4

What is a protein channel ?

Answer 4

= contain a channel through the centre
= lined with hydrophilic amino acids
= filled with water molecules
= allow water soluable molecules + ions to diffuse through

Question 5

What are carrier proteins?

Answer 5

= can change their shape + position
= to transfer molecules or ions from one side of the membrane to another

Question 6

What are extrinsic proteins?

Answer 6

= do not spam the membrane
= found on one side of the membrane or the other
= sometimes attached to intrinsic proteins

Question 7

What are the functions of extrinsic proteins?

Answer 7

= structural role
= act as enzymes
= receptors
=

Question 8

What do many membrane proteins contain?

Answer 8

= carbohydrate molecule attached- glycoproteins

Question 9

What are the functions for glycoproteins?

Answer 9

= allow cells to attach to eachother
= play a role in the immune systems
= act as receptors for hormones

Question 10

Where else can carbohydrates also be found attached to?

Answer 10

= phospholipid molecules
= glycolipids
= used when cells come into contact with eachother- glyclopids of one cell can be recognised by another cell deter,ine whether cells come into contact
= antigens