Biology 311C Lecture 24

Biology 311C Lecture 24 - Biology 311C Lecture 24 The first...

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October 21, 2011 Biology 311C Lecture 24 The first stage of photosynthesis is light reactions and the second is the Calvin cycle. Light reactions provide the ATP and the NADP to be used in the Calvin cycle. They reduce CO 2 to form sugar. The whole point of photosynthesis is to reduce CO 2 to get sugars. The light-dependent reactions of photosynthesis occur in thylakoids. The proper sequence for linear flow of electrons during the light-dependent reactions is from water through the photosystems to NADPH. The proper sequence for cyclic flow of electrons during the light-dependent reactions is NADPH to photosystem II. The protons pumped across the thylakoid membrane by the cytochrome complex are used to create a gradient in the stroma synthesis of ATP by the ATP synthase embedded in the thylakoid membrane. At the end of the light-dependent reactions, the energy captures fromt eh sun has been
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