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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This note was uploaded on 02/21/2012 for the course BIO 311 C taught by Professor Mcclelland during the Fall '09 term at University of Texas.