9 - Biological Membranes

Question 1

membrane layers of PM and ER

Answer 1

er
inner luminal leaflet
outer cystosolic leaflet

pm
inner/extra mem

Question 2

why are p-lipids amphiphatic?

Answer 2

region of HYDROPHOB/PHIL

HEAD IS HYDROPHILLIC AND POLAR v.v

Question 3

4 phosholipds?

Answer 3

• phosphotidylcholine
• phosphotidylserine [carries a neg charge]
• phosphotidylethanolamine
• sphingomyelin

Question 4

why is membrane fluidity important?

Answer 4

= allow membranes to fuse

• allow lipids to diffuse
• equal share between daughter cells
• motility change shape

Question 5

fluidity of sat and unsat p-lipids?

Answer 5

unsaturated [db] would be more fluid

Question 6

how is a ohospholipid synt from ER?

Answer 6

/

Question 7

What is a glycolipid?

Answer 7

olipid based on sphingocene with sugar attahced

Question 8

what is the glycocalyx?

Answer 8

carb rich area
made of glycolipids
protects agasint mech damage

Question 9

how are proteins inserted into membrane?

Answer 9

single pass and double pass