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Title: how does photosystem 1 and photosystem 2 cooperate with each other to provide energy for the calvin cycle? Post by: smotwan on Sep 5, 2012 how does photosystem 1 and photosystem 2 cooperate with each other to provide energy for the calvin cycle?
Title: how does photosystem 1 and photosystem 2 cooperate with each other to provide energy for the calvin cycle? Post by: smrj07 on Sep 5, 2012 They produce ATP and NADPH2 for use in fixing CO2 in the Calvin Cycle.
http://library.thinkquest.org/C004535/calvin_cycle.html - The light-dependent portion of photosynthesis is carried out by two consecutive photosystems (photosystem I and photosystem II) in the thylakoid membrane of the chloroplasts. The photosystems are driven by the excited chlorophyll molecules. To begin photosynthesis, the chlorophyll molecule in photosystem II is excited by sunlight and the energy produced helps to break down a water molecule (H2O) into ½O2 (with electrons removed) and 2H+. The removed electrons are excited by the light energy. When the electrons prepare to come to their rest state, they go through an oxidative phosphorylation process and produces an ATP molecule. As the electrons are coming to a resting state, they are excited again in photosystem I and raised to a even higher energy state. The excited electrons are then used to produce NADP+ + H+. The highly energetic NADPH molecule is then fed into the Calvin Cycle to conduct carbon fixation. |