Photosynthesis
- Created by: LHaywood
- Created on: 22-04-15 10:32
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- Photosynthesis
- Light - Dependent Reaction
- Occurs in the thylakoid membrane of the chloroplasts.
- Light energy splits water molecules into hydrogen and oxygen.
- The hydrogen is used to reduce NADP to NAPDH
- Light energy phosphorylate the ADP molecule to form ATP.
- Light energy is first received in photosystem I and then photosystem II
- It excites an electron which provides the energy for ATP production
- Light Independent Reaction (Calvin Cycle)
- Carbon Dioxide from the atmosphere is fixed with RuBP.
- RuBP is Ribulose Bisphosphate
- The reaction is catalyzed by the enzyme RUBISCO
- It forms two molecules of GP
- The GP then forms TP when is reduced and inputted with energy.
- ATP and NADPH form the light dependent reaction is used
- The TP can be made into glucose, reform RuBP or make lipids and other organic molecules.
- Occurs in the stroma of the chloroplast.
- Carbon Dioxide from the atmosphere is fixed with RuBP.
- Basic Equation:
- Carbon Dioxide + Water --> Oxygen + Glucsose
- Limiting Factors
- Light Intensity
- Light limits photosynthesis as the light-dependent reaction requires the light energy to form NADPH and ATP for the light independent reaction
- Light intensity increases so does the rate of photosynthesis up to a certain point and then it levels off as it can not happen any faster
- Carbon Dioxide Concentration.
- Carbon Dioxide Concentration increases the rate to a certain put but then it levels off as there is not enough RuBP to react quick enough and the enzyme RUBISCO has its active site permenantly filled.
- Light Intensity
- Light - Dependent Reaction
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