Multiple Choice
The energy used to produce ATP in the light reactions of photosynthesis comes from __________.
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9. Photosynthesis
Light Reactions of Photosynthesis
Multiple Choice
What is the correct order of steps of the light reactions of Photosynthesis?
A
photosystem I, ETC, photosystem II, NADP+ reduction, chemiosmosis.
B
photosystem I, photosystem II, ETC, NADP+ reduction, chemiosmosis.
C
photosystem II, ETC, photosystem I, NADP+ reduction, chemiosmosis.
D
photosystem II, photosystem I, ETC, NADP+ reduction, chemiosmosis.
Verified step by step guidance1
Begin with Photosystem II, where light energy is absorbed by chlorophyll, exciting electrons to a higher energy level.
These high-energy electrons are then transferred to the Electron Transport Chain (ETC), where they move through a series of proteins, releasing energy used to pump protons across the thylakoid membrane.
Next, the electrons reach Photosystem I, where they are re-energized by another photon of light absorbed by chlorophyll.
The re-energized electrons are used to reduce NADP+ to NADPH, a crucial molecule for the Calvin cycle.
Finally, the proton gradient created by the ETC drives chemiosmosis, where ATP is synthesized from ADP and inorganic phosphate via ATP synthase.
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