Chapter 5 - Membranes

Question 1

what are membranes formed from

Answer 1

a phospholipid bilayer (heads out)

Question 2

what is the fluid mosaic model

Answer 2

the idea that the phospholipids are free to move and allow flexibility

Question 3

what components are included in the fluid mosaic model

Answer 3

cholesterol, glycolipids, glycoproteins, intrinsic and extrinsic proteins

Question 4

what are the two types of intrinsic proteins

Answer 4

channel (allowing passive movement) and carrier proteins (allowing active and passive movement)

Question 5

what are glycoproteins

Answer 5

intrinsic proteins with attached sugar chains. they help cell adhesion and act as receptors

Question 6

what are glycolipids

Answer 6

lipids with attached sugar chains (antigens)

Question 7

what are extrinsic proteins

Answer 7

proteins present in only one side of the bilayer

Question 8

what is the role of cholesterol

Answer 8

regulates fluidity and stability

Question 9

what happens to the bilayer under heat

Answer 9

the kinetic energy means it gains fluidity and can lose its structure. the proteins will denature

Question 10

what happens when a bilayer comes into contact with an organic solvent

Answer 10

they dissolve the membrane (alcohol)