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제목 [Caits Lee] cyclic photophosphorylation
cyclic photophosphorylation 1
작성자 jej*** 등록일 2019-07-26 오전 9:30:04

선생님 제가 cyclic photophosphorylation에 대해서 잘못 알고 있었던거 같아요. 저는 이게 PS II 에서 PS I 으로 간다음 계속 PS I 으로 가는걸 반복하는줄 알았는데 어제 보니깐 아닌거 같아요. 아예 PS I 에서 시작하고 PS I 에서 끝나는게 cyclic phophotophosphorylation 인건가요?


감사합니다.

2019-07-28 오전 9:28:30
학생 안녕하세요
네 학생이 잘못알고 있었나봐요

cyclic 은 ATP 를 extra 로 만들기 위해 PS I 에서 시작하고 PSI으로 끝나는겁니다

열공하세요 ^^

 

In cyclic photophosphorylation, the high energy electron released from P700 to ps1 flow down in a cyclic pathway. In cyclic electron flow, the electron begins in a pigment complex called photosystem I, passes from the primary acceptor to ferredoxin and then to plastoquinone, then to cytochrome b6f (a similar complex to that found in mitochondria), and then to plastocyanin before returning to Photosystem-1. This transport chain produces a proton-motive force, pumping H+ ions across the membrane; this produces a concentration gradient that can be used to power ATP synthase during chemiosmosis. This pathway is known as cyclic photophosphorylation, and it produces neither O2 nor NADPH. Unlike non-cyclic photophosphorylation, NADP+ does not accept the electrons; they are instead sent back to cytochrome b6f complex.

 

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