Biochem 10-31-2013 cell membrane structure

Question 1

(lipid bilayer/transport protiens/receptor proteins/celltocell protein interactions)
is relatively impermeable to a large number of different solutes, this allows the cell to maintain discrete composition in these compartments and to localize specific functions to specific compartments. Allows different metabolic processes to occur simultaneously.

Answer 1

lipid bilayer

Question 2

(lipid bilayer/transport protiens/receptor proteins/celltocell protein interactions)
-the membrane regulates the rate of entry/exit of various, non-lipid soluble molecules. Endo- and exocytosis can be thought of in this category as well.

Answer 2

transport protiens

Question 3

(lipid bilayer/transport protiens/receptor proteins/celltocell protein interactions)
-associated with the membrane, the cell has the capacity to receive, and act on, information about its external environment.

Answer 3

receptor proteins

Question 4

(lipid bilayer/transport protiens/receptor proteins/celltocell protein interactions)
allowing the direct or indirect transfer of information between cells

Answer 4

cell to cell protein interaction

Question 5

all cell generally forms a (square/triangle/spherical) shape in water, the only other material known to ehibit this behavior is (vinegar/oil). the (hydrogen/lipid) nature of the cell membrane was first instuited by this fact

Answer 5

spherical, oil, lipid

Question 6

membrane lipids (are/arent) amphipathic

Answer 6

are

Question 7

(fatty acids/phophoipids) are more cylindrical and natually form a two-layers bilayer

Answer 7

phospholipids

Question 8

(fatty acids/phophoipids) cluster with thier polar head groups out and tails toward center forming micelles

Answer 8

fatty acids

Question 9

lipid bilayers form sphere called ___

Answer 9

liposome

Question 10

planar phospholipid bilayer is energetically (favored/unfavored)

Answer 10

unfavored

Question 11

(hydrophilic/hydrophobic) molecules diffuse across the lipid bilayer

Answer 11

hydrophobic

Question 12

permeability across the lipid bilayer is due to (size/polarity/hydrocarbons)-pick two

Answer 12

size polarity

Question 13

name the two most abundant lipids in cell membranes

Answer 13

glyerophospholipids, sphingophospholipids

Question 14

(glycolipids/sterols) are four ring hydrocarbon

Answer 14

sterols

Question 15

(glycolipids/sterols) a complex molecule containing carbohydrates covalently bound to the lipid

Answer 15

glycolipids

Question 16

(saturated/unsaturated) fatty acids have a kink and are not planar

Answer 16

unsaturated

Question 17

(saturated/unsaturate) fatty acids are planar

Answer 17

saturated

Question 18

why do unsaturated fatty acids have a kink what is it due to?

Answer 18

double bonds

Question 19

the __ and ___ of the fatty acids have implications for the membrane and its fluidity

Answer 19

number of double bonds(degree of unsaturation) and number of carbons (length)

Question 20

oleate and linoleate are (saturated/unsaturated)

Answer 20

unsaturated

Question 21

palmitate and stearate are (saturated/unsaturated)

Answer 21

saturated

Question 22

(sphingophospholipids/glycerophospholipds) glycerol , phosphate group, polar head group

Answer 22

glycerophospholipds

Question 23

(PS/PE/PI/PC) which ones have a negative charge associated with the phophate group

Answer 23

PS,PI

Question 24

1. integral membrane proteins
2. transmembrane
3. lipid linked membrane protiens
4. peripheral membrane proteins
   : includes all proteins directly embedded with the lipid bilayer; contain significant number of hydrophobic amino acids that interact with the hydrocarbon chains of the lipid bilayer

Answer 24

1. integral membrane proteins

Question 25

are integral membrane proteins that completely span the bilayer and have hydrophilic domains interacting with both the ECF and ICF

1. integral membrane proteins
2. transmembrane
3. lipid linked membrane protiens
4. peripheral membrane proteins

Answer 25

2. transmembrane

Question 26

1. integral membrane proteins
2. transmembrane
3. lipid linked membrane protiens
4. peripheral membrane proteins
   proteins may/may not be considered integral membrane proteins (depending on the source); however the protein itself is not embedded within the lipid bilayer, but it is covalently attached to hydrophobic fatty acids or prenyl side chains that are incorporated into the lipid bilayer

Answer 26

lipid linked membrane

Question 27

1. integral membrane proteins
2. transmembrane
3. lipid linked membrane protiens
4. peripheral membrane proteins
   are only associated with other membrane proteins by non-covalent interactions (H-bonds, ionic bonds, van der Waal attractions)

Answer 27

peripheral membrane proteins