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Question

The light-dependent reaction begins with

A
Photosystem I
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B
Photosystem II
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C
Plastoquinone
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D
Plastocyanine
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Solution

The correct option is B Photosystem II
Photosystem II is the first protein complex in the light-dependent reactions of photosynthesis.
It captures photons of light to energize electrons that are transferred through a variety of coenzymes and cofactors to Photosystem I.
The energized electrons are replaced by oxidizing water to form hydrogen ions and molecular oxygen. The hydrogen ions (protons) thus generated help create a proton gradient that is used by ATP synthase to generate ATP.

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