2.4.2~components of cell surface membranes

Question 1

what are the 3 types of lipid in the cell membrane

Answer 1

-phospholipds
-cholesterol
-glycolipids (also containing carbohydrates)

Question 2

2 types of protein in membrane

Answer 2

-glycoprotein (also containing carbohydrates)
-other proteins (eg transport proteins)

Question 3

what do phospholipds form

Answer 3

a bilayer

Question 4

bilayer arrangement

Answer 4

hydrophobic tails (fatty acid chains) point in towards the membrane interior, hydrophilic heads (phosphate groups) point out towards the membrane surface

Question 5

individual phospholipd movement

Answer 5

can move around their own monolayers by diffusion

Question 6

cholesterol molecules polarity

Answer 6

hydrophobic tails and hydrophilic heads

Question 7

cholesterol arrangement

Answer 7

fit between phospholipd molecules and are orientated in the same way

Question 8

is cholesterol in prokaryote membranes

Answer 8

no

Question 9

glycoproteins

Answer 9

proteins with carbohydrate chains attached

Question 10

glycoprotein arrangement

Answer 10

on outer phospholipd monolayer as project out into whatever fluid surrounds the cell

Question 11

proteins embedded within the membrane

Answer 11

intrinsic proteins

Question 12

transmembrane proteins span in membrane

Answer 12

span the entire membrane

Question 13

proteins in inner or outer surface

Answer 13

extrinsic proteins