Inputs And Outputs Of The Light Reactions

Question: Part A - Inputs and outputs of the light reactions

From the following choices, identify those that are the inputs and outputs of the light reactions. (Recall that inputs to chemical reactions are modified over the course of the reaction as they are converted into products. In other words, if something is required for a reaction to occur, and it does not remain in its original form when the reaction is complete, it is an input.) Choices are-light, water, ATP, ADP, NADP+, NADPH, O2, CO2, glucose, and G3P

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Question: Sentences summarizing the redox reactions of photosynthesis: In the light reactions, light energy is used to oxidize _____ to _______

Answer: H2O………..O2

Question: Sentences summarizing the redox reactions of photosynthesis: The electrons derived from the oxidation reaction in the light reactions are used to reduce _______ to ________

Answer: NADP+…….NADPH

Question: Sentences summarizing the redox reactions of photosynthesis: The Calvin cycle oxidizes the light reactions product _____ to ______

Answer: NADPH……NADP+

Question: Sentences summarizing the redox reactions of photosynthesis: The electrons derived from this oxidation reaction in the Calvin cycle are used to reduce ______ to _____

Answer: CO2………G3P

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Answer: 1. Photosystem I

2. Both Photosystem I and Photosystem 2

3. Photosystem 2

4. Both Photosystem I and Photosystem 2

5. Photosystem 2

6. Photosystem 1

Question: For each step of photosynthetic electron flow from water to NADP+, drag the appropriate label to indicate whether or not that step requires an input of energy.

1) Water to P680+

2) P680 to Pq (plastoquinone)

3) Pq to P700+

4) P700 to Fd (ferredoxin)

5) Fd to NADP+

Answer: 1. No energy input recquired

2. Energy input required

3. No energy input required

4. Energy input required

5. No energy input required

Question:

Answer: The rate of O2 production would decrease because the rate of ADP and NADP+ production by the Calvin cycle would decrease