1. Can photo system 1 also absorb light and release electrons? How do the electrons be...

1. Can photo system 1 also absorb light and release electrons? How do the electrons be replaced?

2. What happens during non-cyclic electron flow? What product can be generated?

3. Summarize the events of the dark reaction. (All inputs and outputs)

Solutions

Expert Solution

1. Yes, and the electron in accepted by NADP+ to form NADPH.

The electrons are replaced by photolysis of water which occurs at photosystem 2.

2. Electrons are donated by water to photosystem II which are accepted by photosystem 1 through plastoquinone and plastocyanin. Ultimate electrons are accepted by NADP+ to form NADPH.

During electron transfer Proton gradient is generated across thylakoid membrane. The electrochemical energy stored in this gradient is used by ATP synthase enzyme for the formation of ATP.

3. Calvin cycle is the process of formation of glucose by fixation of atmospheric carbon dioxide. It takes place in stroma of chloroplast. It uses ATP and NADPH which are generated during light reaction. Calvin cycle leads to the formation of triose phosphate which then enters cytosol for the formation of glucose.

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gladiator answered 1 year ago

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