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20 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Where does photosynthesis take place? |
Chloroplasts |
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Stroma |
Liquid inside chloroplasts |
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What kind of reaction is photosynthesis |
Endergonic |
Endergonic or exergonic? |
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2 phases of photosynthesis |
1) light reaction 2)calvin cycle |
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Where do the light reactions take place? |
On the thylakoids |
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Process of light reaction |
Water is consumed and light energy is absorbed and oxygen is produced ATP is produced and high energy electrons used to reduce NADP->NADPH |
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Calvin cycle |
Uses energy from light reactions (ATP, NADPH+) to drive reactions which Co2 is converted to sugar |
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Chlorophyll |
Pigment molecules that absorbs light resulting in excitation of electrons moving them further from their nucleus |
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How many photosystems are there in plants? What do the do |
2 Work together in series to carry out light reactions |
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Photosystem ii |
•reaction center chlorophyll donates high energy electron and replaces it with lower energy electron from H2O (2H2, 1/2 O2,2 e-) •primary electron accepter gives protein to cytochrome complexs then is given to accepter in psii |
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cytochrome complexs |
.... |
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Photosystem ii |
E- accepter gives e- to NADP reductase (linear electron flow) |
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Linear electron flow |
.... |
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Why 2 photosystems? |
1) takes a very high energy electron to reduce NADP (more that what is produced by 1 photon of light) 2) Excess energy made is used by the cytochrome complex to pump protons across the thylakoid membrane -> producing Atp |
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3 phases of calvin cycle |
1) carbon fixation 2) reduction 3) regeneration |
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Carbon fixation in calvin cycle |
•3 co2+ RuBp (5 carbon molecule)->3×6 carbon molecules breakdown into 6 3 carbon molecules (3pg) ×6 •Rubisco catalysis reaction (50% if leaf protein is Rubisco |
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Rubisco |
..... |
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Reduction in calvin cycle |
6(3pg) converted to G3p×6 -this is an endergonic reaction costing 6 ATP |
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Regeneration in calvin cycle |
6 G3p go on and are converted to 3×RuBp (costing 3 ATP) -6 turns of calvin cycle gives out 2 G3p's |
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3 reasons for calvin cycle |
1) the cell net gains ATP 2) needs stored ATP for night 3)Glucose is used for more than just an energy source (ex/ cellulose ->cell wall) |
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