lecture 7

Question 1

in glycoproteins sugars face ___ and were created where?

Answer 1

out, lumen

Question 2

external embedded membrane proteins

Answer 2

face the ECM. sitting just in one half of the phospholipid bilayer

Question 3

internal integral membrane proteins

Answer 3

face the cytoplasm. only go through one level of the bilayer

Question 4

transmembrane integral membrane proteins

Answer 4

go all the way though the lipid bilayer

Question 5

peripheral proteins

Answer 5

sit next to , but not in, the lipid bilayer

Question 6

vescile vs micelle

Answer 6

micelle: phospholipids with ONE TAIL
vesicle: 2 tails, and 2 layers of phospholipids that form an inner aqueous compartment

Question 7

what type of proteins do we say are detergent soluble

Answer 7

integral

Question 8

Properties of membranes

Answer 8

A. Flexible shape/fluidity due to phospholipids (especially unsaturated ones)

B. Phospholipids form barrier to polar molecules

C. Transmembrane proteins create selective permeability to some polar molecules

1. Easy to break and reseal
2. Is the interface between outside and inside aqueous compartments

Question 9

The surface area of phospholipids extracted from a red blood cell is ___the surface area of a cell

Answer 9

2x

Makes sense bc it’s a lipid BILAYER- aka you need 2x the amount of them

Question 10

only the (inner/outer) membrane is HIGHLY IMPERMEABLE

(inner/outer) is permeable- because of a beta barrel aka ‘porin’

Answer 10

inner

outer

Question 11

____ works whether the glucose is higher or lower whereas _____ would not get anywhere without a gradient

(passive, active)

Answer 11

active, passive/facilitated

Question 12

Triacylglycerols are not found in cell membranes because they are

Answer 12

not amphipathic.

Question 13

are fatty acids amphipathic

Answer 13

yes