Electron Transport in Photosynthesis

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The above illustration draws from ideas in both Moore, et al. and Karp to outline the steps in the electron transport process that occurs in the thylakoid membranes of chloroplasts during photosynthesis. Both Photosystems I and II are utilized to split water to get electrons. Electron transport helps establish a proton gradient that powers ATP production and also stores energy in the reduced coenzyme NADPH. This energy is used to power the Calvin Cycle to produce sugar and other carbohydrates.

The electron transport process outlined here is characteristic to the approach to photophosphorylation called "non-cyclic electron transport". There is also an electron transport process in the cyclic electron transport process which uses only Photosystem I to produce ATP without providing the reduced coenzymes necessary to proceed with further biosynthesis.

Electron transport in the mitochondria for oxidative phosphorylation
Energy cycle in living things

Photosynthesis Concepts

Moore, et al.
Ch 7

Ch 6
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