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A Level Biology Edexcel: Topic 5 - 8

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Question:

Outline the light dependent reaction

Author: seremi amune



Answer:

Light energy is absorbed by the chlorophyll in PSII causing electrons to be excited and boosted to a higher energy level the electrons are picked up by an electron acceptor the electrons move down an ETC through a series of redox reactions to PSI as the electrons move down the ETC, they release energy which is used for chemiosmosis The electrons lost in PSII are replaced by the photolysis of water oxygen is given off as a waste gas and H+ ions and electrons are used to form NADPH and ATP


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