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Lecture 7

Biology 1002B Lecture Notes - Lecture 7: Light-Independent Reactions, Carbon Fixation, Glyceraldehyde 3-Phosphate


Department
Biology
Course Code
BIOL 1002B
Professor
Patrick Mc Donald
Lecture
7

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Biology 1202 B
Lecture Cycle 3 (Lecture 7)
Photosynthesis
Material Covered – Cyclic Electron Transport, Calvin Cycle,
Photorespiration
Photosynthesis Overview
2 disnct processes:
1. Light Reacons (Thylakoid membrane)
- Capture of light energy
- Synthesis of ATP and NADPH
2. Calvin Cycle (Stroma)
- Reducon of carbon dioxide
- Producon of carbohydrates
Linear Electron Transport
As you move down the path in the ETC, it becomes harder to
oxidize the molecules.
Need to photons of light to reduce NADP+ to NADPH.
Cyclic Electron Transport
Photosystem I can operate independently.
NADPH is not produced
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ATP is produced
Reducon of carbon dioxide
in Calvin Cycle requires more
ATP than NADPH
Other energy requiring in the
chloroplast also require ATP
Noncyclic electron transport
produces approximately
equal quanes of NADPH
and ATP.
Nicotinamide Adenine Dinucleotide phosphate
Involved in many biochemical redox processes
NADP+ reduced to NADPH
- Light reacons
NADPH used to reduce other molecules
- Calvin Cycle
Photosynthesis
The Calvin Cycle
Produces G3P which leaves the cycle
- Most G3P is recycled so the cycle can connue
Carbon 7xed (a8ached) to a larger molecule each turn of the cycle
- Every 3 turns produces an excess 3 carbon sugar glyceraldehyde-3-phosphate (G3) – 2
cycles need to generate a molecule of glucose.
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