10 Questions
In non-cyclic photophosphorylation, how many water molecules are required?
12
What is another name for the Light Reaction?
Hell Reaction
What is the role of cyclic photophosphorylation in PS-I?
To fulfill the deficiency of electrons
What is the acceptor of 2e- in PEA Lite?
TETS
What is the outcome of non-cyclic photophosphorylation in terms of NADPH production?
12 NADPH are produced
What is the first stable product formed in the C₂-cycle?
3 Carbon Compound
What is the outcome of the 3 stops in the Calvin Cycle?
1 Carboxylation
What is the role of RuBP in the Calvin Cycle?
Carboxylation
What is the byproduct of the reduction step in the Calvin Cycle?
2 PGAL
Who is credited with the discovery of the Calvin Cycle?
Colvin
Study Notes
Light Reaction
- Non-cyclic photophosphorylation produces 1 ATP and 1 NADPH, requiring 12 water molecules.
- Deficiency of electrons in PS-I is fulfilled by cyclic photophosphorylation.
- Cyclic photophosphorylation produces 2 ATP and no NADPH.
- PEA (Plastocyanin) is an electron acceptor in PS-I.
- Light reaction also called Hill reaction or 2-scheme.
Dark Reaction (Calvin Cycle)
- Also called C₂-cycle or Biosynthetic pathway.
- Discovered by Calvin.
- 3 stages: Carboxylation, Reduction, and Regeneration.
- Carboxylation: RuBP (Ribulose 1,5 Biphosphate) is converted to 2X3-PGA (Phosphoglyceric Acid).
- Reduction: 2 ATP and 2 NADPH are used to convert 2X3-PGA to 2XGAL (Phosphoglyceraldehyde).
- Regeneration: RuBP is regenerated so the cycle can continue.
- Output: 1 glucose molecule is formed per 3 turns of the Calvin Cycle.
Test your understanding of light reactions, including cyclic and non-cyclic photophosphorylation, electron transport chains, and ATP production in photosynthesis. Learn about the role of PS-I, PEA, and NADPH in this process.
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