lecture 3 Flashcards
1
Q
does water follow or leave sugar areas?
A
follows
2
Q
what is osmosis
A
water flow across a semi-permeable membrane
3
Q
what do plants use solutes to regulate?
A
pressure potential
4
Q
would plant cells burst with constant water moving across the membrane?
A
no, rigid cell wall to prevent lysis (cell rupture)
5
Q
what are aquaporins
A
water channels in plant cells
6
Q
what do thermodynamic gradients do?
A
- water diffuses from pore orifice
- water pulled through channel by cohesion
- water potential is increased in cytoplasm
7
Q
what is tetramer
A
each monomer forms a water channel (aquaporins)
8
Q
what does phosphorylation and pH do?
A
modify aquaporin channel activity
9
Q
what do aquaporins facilitate?
A
rapid plant movements
10
Q
cells that are enriched with auraporins are …
A
cells that need high rate of water movement such as motor cells
11
Q
A
