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Photosynthesis

QuestionAnswer
Photosynthesis Equation 6H2O + 6CO2 +light goes to 6O2 + C6H12O6
Light Dependent Reactions photosystem 1 and 2; electrons from water are excited by light to create NADPH and ATP
Light Independent Reactions Calvin Cycle; NADPH and ATP from light dependent rxns used to create glucose
What are photosystems? proteins with several molecules of chlorophyll, which collects energy from the sun
What generally happens in photosystem 2? Water is split to form O2 and H+, O2 is released as final electron acceptor
Where do electrons go after photosystem 2? the ETC with cytochrome C where the electrons are drained of energy to move protons to thylakoid space
Where do electrons go to be filled with energy again? Photosystem 1
Products of light dependent reactions ATP, NADPH, and O2 (which are used in Calvin Cycle)
When can a plant run out of NADP+? When it's really sunny
Why does NADP+ run out when it's sunny? The calvin cycle uses up ATP and NADPH, and there will be so much NADPH made that no NADP+ will be left, so cyclic flow in photosystem 1 needs to happen
First reaction (carbon fixation) uses rubisco; takes CO2 and attaches it to another molecule
Second reaction (reduction) investing electrons from NADPH and makes G3P, which can be used to make glucose
Third reaction (regeneration) remaining molecules are processed to regenerate RuMP
What allows the Calvin Cycle to restart? Converting ATP to ADP, which allows for RuMP to go to RuBP
Created by: madalynes
 

 



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