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Start studying AP Biology - Photosynthesis: Electron Flow. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
A route of electron flow during the light reactions of photosynthesis that involves both photosystems and produces ATP, NADPH, and oxygen. The net electron flow is from water to NADP+.
During the light reactions, there are two possible routes for electron flow: cyclic and noncyclic. Noncyclic electron flow, the predominant route, produces both ATP and NADPH. Photosystem II absorbs a photon of light. One of the electrons of P680 is excited to a higher energy state.
30 lip 2022 · A photon strikes photosystem II to initiate photosynthesis. Energy travels through the electron transport chain, which pumps hydrogen ions into the thylakoid space. This forms an electrochemical gradient.
In the light reactions, the protons are trapped, instead, in the thylakoid space (2), and flow back to the stroma (1) through an ATP synthase channel. Because light powers the electron transport chain that generates this proton gradient during photosynthesis, the process is called photophosphorylation.
Linear electron flow is, fortunately, easier than it looks. It is an electron transport chain, somewhat like the one we worked through in cellular respiration. While reading the section “Linear Electron Flow,” label the diagram number by number as you read.
