7.2 permeability of the lipid bilayer Flashcards
1
Q
what goes through lipid bilayer easily
A
nonpolar stuff
2
Q
what cannot go through h
A
ions and other polar molecules
hydrophilic stuff
3
Q
how do these things go through the membrane
A
the transport proteins
(transmembrane proteins)
_facilitated diffusion
4
Q
channel proteins
A
have a channel that lets hydrophilic things pass through
5
Q
aquaporins
A
channel proteins that allow water to diffuse in and out of cells
(3 billion water molecules per second )
6
Q
carrier proteins
A
transport proteins that hold onto their passenger and shape shift so they can shuttle across the membrane
7
Q
kidneys aquaporins
A
laws them to reclaim water from urine before excretion
8
Q
ion channels
A
- including gate channels
- which open and close in response to stimulus
