2.2.1

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  1. overview on light dependent reactions (2)
    -transform energy in sunlihgt to chemical energy

    -excited electrons either produce NADPH or are donated to ETC which produces ATP
  2. Light independent reactions
    -starts eith enzyme rubisco that catalyzes the addition of CO2 to a five carbon molecule that ultimately resutls in production of sugar
  3. Image Upload (2)
    -light dependent reactions produce chemical energy (ATP- NADPH)

    -chemical energy is used with light independent reactions to produce chemical energy (glucose)
  4. HOw many chloroplasts in each cell?
    40-50 cells
  5. Image Upload
  6. Thylakoid
    individual pouch
  7. Granum
    stack of thylakoids
  8. Stroma
    cytoplasm like subsatnce
  9. Image Upload
    -
  10. Red waves (2)
    -has less energy

    -larger wave length
  11. Blue waves (2)
    -has more energy

    -smaller waves
  12. Where do light dependent reactions occur?
    thylakoids
  13. Where do light independent reactions occur?
    in stroma
  14. When light is absorbed...
    electron enter an excited state
  15. Carotenoids and free radicals
    Carotenoids act to quench free radicals by accepting or stabilizing unpaired electrons
  16. Why are plants green? (2)
    -there is a heavier presence of chlorophylls

    -and they cannot absorb green light
  17. What 2 colors do chlorophylls absorb best?
    blue and red light
  18. What 2 colors do carotenoids absorb best?
    blue and green light
  19. How to isolate pigments using paper chromatography? (3)
    • 1. grind leaves and add organic solvent
    • *pigment molecules move from leaves into solvent

    2. Spot pigments on filter paper

    3. Seperate pigments in solvent
  20. What is absorption spectrum
    it is what a particular chemical absorbs
  21. What is action spectrum
    • it is what absorbed lights produce a response
    • *pigments that absorb blue and red light are most effective at triggering PS
  22. Image Upload (3)
    -hydrophobic tail plays a role in keeping parts of chlorophyll in a membrane

    -business end of molecule: Metal ion in the center held down by nitrogen

    -ring struture in head absorbs light
  23. What is the only difference between CHlorophyll a and b?
    A has CH3 and B has CHO
  24. What happens if small changes in the ring happen?
    it dictates what types of wavelengths it can absorb
  25. Image Upload (3) Flourescense
    - Absorbs photon, raises electron to a new energy level

    • -then electron goes back to a lower level
    • *as it goes down it gives off a photon of light that is lower in energy

    • -HAs no consequence as far as PS is concern
    • *dead end reaction
  26. Image Upload Resonance (3)
    -photon is absorbed by one chlorophyll molecule

    • -electron hops to one to the other
    • *all chlorophylls are connected by antena complex

    -
    There is an area called reaction center, where the electron will be promoted then given off somewhere
  27. Image UploadRedox reactions
    -excited electron will be handed off to a different molecule called electron acceptor
  28. At the reaction center, excited electrons are usually passed to...
    • an electron acceptor
    • *usually phenophylin
  29. Image Upload(2)
    -pheophytin takes excited electron and passes it off to PQ.

    • -PQ then takes molecule and hands it off  to other proteins in cytochrome complex
    • *PQ and cytochrome complex are ETC

Card Set Information

Author:
efrain12
ID:
201533
Filename:
2.2.1
Updated:
2013-02-19 00:32:23
Tags:
bios
Folders:

Description:
first part of P/S
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