Biochem 10-31-2013 cell membrane structure Flashcards Preview

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Flashcards in Biochem 10-31-2013 cell membrane structure Deck (27):
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.

lipid bilayer

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.

transport protiens

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.

receptor proteins

4

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

cell to cell protein interaction

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

spherical, oil, lipid

6

membrane lipids (are/arent) amphipathic

are

7

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

phospholipids

8

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

fatty acids

9

lipid bilayers form sphere called ___

liposome

10

planar phospholipid bilayer is energetically (favored/unfavored)

unfavored

11

(hydrophilic/hydrophobic) molecules diffuse across the lipid bilayer

hydrophobic

12

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

size polarity

13

name the two most abundant lipids in cell membranes

glyerophospholipids, sphingophospholipids

14

(glycolipids/sterols) are four ring hydrocarbon

sterols

15

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

glycolipids

16

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

unsaturated

17

(saturated/unsaturate) fatty acids are planar

saturated

18

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

double bonds

19

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

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

20

oleate and linoleate are (saturated/unsaturated)

unsaturated

21

palmitate and stearate are (saturated/unsaturated)

saturated

22

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

glycerophospholipds

23

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

PS,PI

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

1. integral membrane proteins

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

2. transmembrane

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

lipid linked membrane

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)

peripheral membrane proteins