membrane structure and function lecture 1+2 - 3/3

Question 1

define ampiphatic

Answer 1

any molecule with hydrophobic and hydrophillic components

Question 2

glycolipids function

Answer 2

outer membrane only
signalling, recognition, adhesion

Question 3

cholesterol function in membranes

Answer 3

stiffened region maintains membrane straightness

Question 4

how does the head size of phospholipids affect cell shape

Answer 4

big heads = more curvature

Question 5

synthesis of membrane lipids

Answer 5

acetyl CoA + fatty acid tails + glycerol phosphate -> phophatidic acid
incorporated into ER cytosol membrane
phosphatase adds OH group
choline phosphotransferase replaces OH with phosphate + choline
moved to other side of membrane by flippase protein

Question 6

how does a newly synthesised membrane lipid get to the cell membrane

Answer 6

vesicle formed from ER fuses with membrane

Question 7

define uniport

Answer 7

one ligand binds
one ligand released on the other side of the membrane
slow

Question 8

define symport

Answer 8

protein which allows for cotransport
2 molecules moving in same direction

Question 9

define antiport

Answer 9

protein which allows for exchange of molecules
opposite direction

Question 10

focal adhesion

Answer 10

protein which binds the end of a cell from the inside its membrane to another membrane

Question 11

define tight junction connections

Answer 11

joins groups of the same cells together from the side
like velcro