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BIO FINAL: EXAM II
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amniotic egg
contains embryonic mmbranes
membranes in amniotic egg:
amnion
chorion
allantois
diffusion
when something moves in or out (down its concentration gradient)
moves high to low
diffusion boundry layer*
water potential
solute potential+physical pressure
water potential will go down if:
you dissolve solutes in water
solutes always
lower water potential
chemiosmosis
creation of a transmembrane proton gradient, which generates a membrane potential
membrane potential
a source of potential energy that the cell can use to perform work
phloem sap moves from:
source to sink
sink
where sucrose is being used
source
where sucrose is being made
sieve tube members
the cells that transport the phloemsap
what mechanism transports phloem sap?
pressure flow model
pressure flow model
1. sucrose moves into the sieve tube member by active transport
2. that makes water potential in sieve tube member goes down
3. water from surrounding tissues enters the sieve tube member
4. water coming in generates positive pressure
5. at the sink, sucrose leaves the sieve tube member
6. this causes the water potential in the sieve tube member to go up
7. water leaves
animal embryology*
on si practice exam
Author
hayesme
ID
17386
Card Set
BIO FINAL: EXAM II
Description
key terms and concepts
Updated
2010-05-05T06:30:24Z
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