Photosynthesis part 1

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  1. Photosynthesis:"synthesis from __"
    light
  2. Plants take in __, produce __ & release __ & __
    CO2; carbs (glucose); H2O; O2

    (Light is required. O2 comes from H2O)

    (page 2 on slide)
  3. CO2 enters while H2O & O2 exit through a leaf's __
    stomata

    (page 4 on slide)
  4. High atmospheric CO2 indicates __ stomata density. Low atmospheric CO2 indicates __ stomata density.
    low (prevents H2O loss); high

    (page 5 on slide)
  5. The light reaction pathway of photosynthesis involves converting __ energy to chemical energy as __ & __
    light (photon); ATP; NADPH (plant's electron carrier)
  6. The light-independent reaction pathway of photosynthesis involves using __ & __ (from the light reactions) plus __ to produce __
    ATP; NADPH; CO2; carbs
  7. Photosynthesis occurs in the __
    chloroplast

    (page 7 & 8 on slide)
  8. Chlorophyl is found in the __ matrix
    thylakoid

    (page 8, 14, & 16 on slide)
  9. When light energy is __, the molecule acquires the energy of the photon. The molecule goes from ground state to __ state.
    absorbed; excited

    (page 12, 13, & 16 on slide)
  10. Noncyclic electron transport produces __ & __ from H2O
    NADPH (reduced electron carrier); ATP
  11. Cyclic electron transport produces __
    ATP only
  12. Noncyclic ET: Light energy is used to __ H2O
    oxidize

    H2O > O2, H+, electrons
  13. Noncyclic ET (photosystem II): After excitation by light, __ is an unstable molecule & seeks electrons
    P680+

    • P680 > P680+ + e-
    • P680 loses electrons

    (page 18 on slide)
  14. Noncyclic ET (photosystem II): __ is a strong oxidizing agent & takes electrons from __
    P680 (P680+); H2O (splitting the H2O molecule)

    (P680+ is the strongest biological oxidizing agent known.)

    (page 18 on slide)
  15. "Z scheme" model of noncyclic ET: extracts electrons from __ & transfers them to __, using energy from photosystems I & II & resulting in __
    H2O; NADPH; ATP synthesis
  16. The noncyclic pathway yields __
    NADPH, ATP, & O2
  17. Electrons from P680 goes to __
    plastoquinone
  18. Energy of e- from plastoquinone allows  __ to pump H+ from the __ side to __ side.
    cytochrome; stroma; thylakoid lumen
  19. e- from cytochrome then goes to __ to __.
    plastocyanin; photosystem I
  20. steps in noncyclic pathway (from photosystem II to photosystem I)
    • 1. Light hits chlorophyl in photosystem II, causing excitation of P680.
    • 2. e- from P680 goes to plastoquinone.
    • 3. P680 is now P680+ and is unstable and needs e-
    • 4. P680+ takes e- from H2O, splitting the H2O molecule. (P680 then becomes stable)
    • 5. O2 & H+ are byproducts in the thylakoid side.
    • 6. Energy of e- from plastoquinone allows cytochrome to pump H+ from stroma side to thylakoid lumen side.
    • 7. Cytochrome pumps 2 H+ for every e, creating a proton gradient.
    • 8. e- from cytochrome then goes to plastocyanin to photosystem I.

    (page 24 on slide)
  21. Light hits chlorophyl in photosystem I, causing __ to lose e- to __.
    P700; ferredoxin
  22. P700+ gets e- from __ to become stable again.
    plastocyanin
  23. e- from ferredoxin moves to __, in which __ becomes __
    ferredoxin-NADP reductase; NADP; NADPH
  24. steps in noncyclic pathway (photosystem I)
    • 9. (occurs after photosystem II) Light hits chlorophyl in photosystem I, causing P700 to lose e- to ferredoxin.
    • 10. P700 is now P700+. P700+ gets e- from plastocyanin to become stable again.
    • 11. e- from ferredoxin moves to ferredoxin-NADP reductase, in which NADP becomes NADPH (redox reaction)
    • 12. H+ is removed from stroma side. Now there is a proton gradient.
    • 13. H+ in thylakoid lumen is diffused through ATP synthase to stroma side to create ATP

    (page 24 on slide)

Card Set Information

Author:
sophathida
ID:
324375
Filename:
Photosynthesis part 1
Updated:
2016-10-11 04:46:02
Tags:
photosynthesis light noncyclic NADPH photosystem
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Description:
Week 3: Ch. 9
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