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BIO 110

Okay, um, so, the light reactions. They happen in the thylakoid membrane, right, write that down.

And um, this will be on the exam: water gets split, that's photolysis, and that's where the oxygen comes from.

Not from CO₂, right? It all goes into ATP and NADPH.

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The light reactions

Happen in the thylakoid membrane of the chloroplast.
Photolysis splits water:\mathrm{2H_2O \to 4H^+ + 4e^- + O_2} $\mathrm{2H_2O \to 4H^+ + 4e^- + O_2}$
Energy is stored in ATP and NADPH for the Calvin cycle.

Exam alert

Your professor said this will be on the exam: the O₂ comes from water, not CO₂.

5 flashcardsQuizPodcast

The light reactions1 of 5

Where does the O₂ in photosynthesis come from?

The light reactions1 of 5

Answer

Water, split by photolysis in the thylakoid membrane.

thylakoid membranephotolysisthis will be on the exam

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