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Photosynthesis

Last updated

Jun 3, 2019
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- pH and Water
- Proteins

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Compare photosynthesis to respiration:

Respiration

C6H12O6 + 6O2 → 6CO2 + 6H2O

ΔG^o’ = -2840 kJ/mol

Photosynthesis in green plants

6 CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

ΔG^o’ = +2840 kJ/mol (Unfavorable ΔG^o’ explains the need for energy input.)

Compare photosynthesis in plants with bacteria

Plants (divided by 6, H₂O added to each side)

CO₂ + 2 H₂O → C(H₂O) + O₂ + H₂O

Photosynthesis in green sulfur bacteria

CO₂ + 2H₂S → C(H₂O) + 2S + H₂O

Photosynthesis in purple non-sulfur bacteria

CO₂ + 2CH₃CHOHCH₃ → C(H₂O) + 2CH₃COCH₃+ H₂O

isopropanol acetone

C O2 + 2 CH₃CHOHCOOH → C(H₂O) + 2 CH₃COHCOOH + H₂O

lactate pyruvate

Generalize

CO₂ + 2H₂D → C(H₂O) + 2D + H₂O

D = H/electron donor

So the light reactions must produce NADPH and ATP to provide energy and H

The light reactions occur on the thylakoid membranes of chloroplasts (or the plasma membrane or internal membranes of bacteria).

(Note the “lumen” of thylakoids)

The light reactions occur on the thylakoid membranes of chloroplasts (or the plasma membrane or internal membranes of bacteria).

Light reactions

• 2 photosystems

• transfer of e- from H2O (in the lumen) to NADP+ (in the stroma)

• transfer of H+ from stroma to lumen (and back through ATP synthase)

Light reactions

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