Biological __________ define the external boundaries of cells and separate compartments within cells
Membranes
1 of 21
Some membrane proteins serve as selective ________ that control the transport of ions and small molecules in and out of the cell
Pumps
2 of 21
Membranes are responsible for generating and __________ the proton gradients essential for the production of ATP
Maintaining
3 of 21
Detergents in ___________ environments can spontaneously form micells or monolayers
Aqueous
4 of 21
Lipid __________ are the main structural component of all biological membranes
Bilayers
5 of 21
A lipid bilayer is around _____ nm thick
5-6
6 of 21
The spontaneous formation of lipid bilayers is driven by the _____________ interactions
Hydrophobic
7 of 21
There are ___ classes of membrane proteins
3
8 of 21
The three classes of membrane prroteins are ____________, peripheral membrane proteins and lipid anchored proteins
Integral membrane proteins
9 of 21
____________________ are also referred to as a transmembrane proteins - as they usually span the bilayer completely with one part exposed at each end
Integral membrane proteins
10 of 21
With integral membrane proteins, the part that spans the membrane is most often an _________
Alpha helix
11 of 21
____________ are associated with one face of the membrane through charge-charge interactions and hydrogen bonding (with integral proteins or polar heads)
Perhipheral membrane proteins
12 of 21
Peripheral membrane proteins are ___________ dissociated by the membranes
More easily dissociated
13 of 21
Lipid anchored membrane proteins are tethered to a membrane through a ___________ bond to a lipid anchor
Covalent
14 of 21
Membrane proteins are very hard to work with because
They do not crystallise readily
15 of 21
You can predict the presense of transmembrane alpha helices using algorithms and _____________ amino acids
Hydrophobic
16 of 21
Proteins only undergo _________ diffusion
Lateral
17 of 21
Lateral diffusion is ________
Fast
18 of 21
Transverse diffusion is ________
Slow
19 of 21
Limited diffusion of membrane proteins creates a __________ membrane
Heterogenous membrane
20 of 21
A few membrane proteins move quickly, but most move slowly - around ____________ times slower than lipids
100 - 500
21 of 21
Other cards in this set
Card 2
Front
Some membrane proteins serve as selective ________ that control the transport of ions and small molecules in and out of the cell
Back
Pumps
Card 3
Front
Membranes are responsible for generating and __________ the proton gradients essential for the production of ATP
Back
Card 4
Front
Detergents in ___________ environments can spontaneously form micells or monolayers
Back
Card 5
Front
Lipid __________ are the main structural component of all biological membranes
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