Problem Set 3 S10 KEY

E what are the three stages of the dark reactions

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Unformatted text preview: the three stages of the dark reactions? List each stage and then, in a FEW words, give an overview of what occurs in that stage. 1) 2) 3) Carbon Fixation: CO2 is introduced into the Calvin cycle by bonding to RuBP. Reduction: 3PG is reduced by NADPH and ATP to generate G3P, a 3C sugar. Regeneration: ATP is used to drive the production of the 5C RuBP molecule from the 3C G3P sugar. RuBP can then accept another C from CO2 via step 1 to reinitiate the cycle. 16) What is the name of the ringed molecule that stores the excited electron temporarily in the photosystems? Chlorophyll. 17) Is CO2 used in the DARK reactions or the LIGHT reactions? (Circle one) What is the name of the molecule that accepts this CO2? RuBP. 18) Both electron flow and the Calvin cycle cease when a plant is placed in the dark. Which of the two reactions will stop first? Why? The E from sunlight is required to excite e- in the photosystems. When light is absent, e- can no longer be excited stopping the flow of e- down the electron transport system. The light reac...
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