transport across cell membranes Flashcards
1
Q
passive transport 4
A
- in motion
- random movement
- constantly bouncing around
- net movement of molc or ions from a region of high conc to a reigon of low or equally distributed conc.
2
Q
facilitated diffusion 5
A
- charged ions and polor molc
- transmembrane channels
- passive
- down a conc grad
- uses protein channels and carrier proteins
3
Q
protein channels 5
A
- water filled (hydrophilic channels)
- specific water soluble ions
- ions not present=closed=controlled
- ions bind=change in shape
- closed on one side and open on the other
4
Q
carrier proteins 3
A
particles are taken up by carrier proteins = change in shape=release to other side
5
Q
osmosis 4
A
- passage of water from a high water potential to a low water potential through a selectively permeable membrane
- substance dissolved in solvent=solute
- solvent+solute=solution
- measured in kpa
6
Q
active transport 3
A
- movement from low to high using ATP and carrier proteins
- directly moves molc using ATP
- moves molc using a conc grad ->co transport
7
Q
how is active transport different to passive
A
- uses ATP
- against conc grad
- proteins (carrier) pumps
- selective
8
Q
Active transport of a single molc/ion
A
- molc bind to protein receptor site
- ATP binds to protein = ADP=change in protein =released
- protein releases phosphate =reverts shape in ADP->ATP during respiration