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Questions and Answers
In non-cyclic photophosphorylation, how many water molecules are required?
In non-cyclic photophosphorylation, how many water molecules are required?
What is another name for the Light Reaction?
What is another name for the Light Reaction?
What is the role of cyclic photophosphorylation in PS-I?
What is the role of cyclic photophosphorylation in PS-I?
What is the acceptor of 2e- in PEA Lite?
What is the acceptor of 2e- in PEA Lite?
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What is the outcome of non-cyclic photophosphorylation in terms of NADPH production?
What is the outcome of non-cyclic photophosphorylation in terms of NADPH production?
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What is the first stable product formed in the C₂-cycle?
What is the first stable product formed in the C₂-cycle?
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What is the outcome of the 3 stops in the Calvin Cycle?
What is the outcome of the 3 stops in the Calvin Cycle?
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What is the role of RuBP in the Calvin Cycle?
What is the role of RuBP in the Calvin Cycle?
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What is the byproduct of the reduction step in the Calvin Cycle?
What is the byproduct of the reduction step in the Calvin Cycle?
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Who is credited with the discovery of the Calvin Cycle?
Who is credited with the discovery of the Calvin Cycle?
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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.
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Description
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.
