Chp3 Membranes

Question 1

Amphipathic

Answer 1

contains both hydrophilic and hydrophobic regions

Question 2

The name of the phospholipid with a a choline polar head group is called ______ (____)
does it contain an amine of hydroxyl group

Answer 2

Phosphatidylcholine (lecithin)

amine

Question 3

The name of the phospholipid that has a serine polar head group is called _______
does it contain an amine or hydroxyl group

Answer 3

Phosphatidylserine

amine

Question 4

The phospholipid with the polar head group ethanolamine is called ________
does it contain an amine or hydroxyl group

Answer 4

phosphatidylethanolamine

amine

Question 5

The phospholipid with the polar head group glycerol is called _______
does it contain a hydroxyl or amine group

Answer 5

phosphatidylglycerol

hydroxyl

Question 6

The phospholipid with the polar head group inositol is called _____
does it contain a hydroxyl or amine group

Answer 6

Phosphatidylinositol

hydroxyl

Question 7

sphingomyelin is a ______ found in high concentrations in _______

Answer 7

phospholipid

nerve cells

Question 8

serine phospholipids are generally found on the ____ leaflet and when they migrate to the _____ leaflet they cause ________

Answer 8

inner
outer
apoptosis

Question 9

what are the 4 types of phospholipid movements

Answer 9

1. lateral (primarily head)
2. rotation (spins)
3. flexion (in between tails)
4. migration (one leaflet to another)

Question 10

What are two functions of cholesterol in the phospholipid bilayer

Answer 10

makes membrane more rigid

makes lipid rafts that aid in cell signaling

Question 11

is cholesterol amphipathic

Answer 11

yes

Question 12

what is a calveole

Answer 12

A dip in the cell membrane containing a protein called calveolin

Question 13

What does the glycocalyx in eukaryotes do

Answer 13

It s a sticky formation of glycolipids that serves as a sticky layer of protection

Question 14

What are the three types of membrane proteins where are they located what is their hydrophylicity

Answer 14

1. transmembrane - spans whole membrane - hydrophobic part in hydrophilic part out
2. Lipid-anchored - bonded to lipid - embedded in membrane but does not span the whole membrane can be on inside or outside leaflet
3. peripheral - associated with the membrane but not embedded - found on cytosolic side

Question 15

Peripheral proteins are found on which side of the cell membrane

Answer 15

cystosolic (inside)

Question 16

lipid anchored proteins are found on which side of the membrane

Answer 16

inner or outer

Question 17

What portion of a transmembrane protein is hydrophobic

Answer 17

the middle portion