BIO FINAL: EXAM II

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Author:
hayesme
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17386
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BIO FINAL: EXAM II
Updated:
2010-05-05 02:30:24
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key terms concepts
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key terms and concepts
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  1. amniotic egg
    contains embryonic mmbranes
  2. membranes in amniotic egg:
    • amnion
    • chorion
    • allantois
  3. diffusion
    • when something moves in or out (down its concentration gradient)
    • moves high to low
  4. diffusion boundry layer*
  5. water potential
    solute potential+physical pressure
  6. water potential will go down if:
    you dissolve solutes in water
  7. solutes always
    lower water potential
  8. chemiosmosis
    creation of a transmembrane proton gradient, which generates a membrane potential
  9. membrane potential
    a source of potential energy that the cell can use to perform work
  10. phloem sap moves from:
    source to sink
  11. sink
    where sucrose is being used
  12. source
    where sucrose is being made
  13. sieve tube members
    the cells that transport the phloemsap
  14. what mechanism transports phloem sap?
    pressure flow model
  15. 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
  16. animal embryology*
    on si practice exam

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