Lecture 16 - Photosynthesis II – Stage of Photosynthesis

Lecture 16 - Photosynthesis II – Stage of Photosynthesis

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Unformatted text preview: Lecture 16 Photosynthesis I I – Stage of Photosynthesis Stage 1 Light Dependent Reactions Stage 2 Light Independent Reactions A. Light Dependent Reactions- Thylakoid membrane – photosystems (figs 9-10, 9-11) • Antennae • Reaction center • PSI – P700 • PSII – P680- Noncyclic photophosphorylation(fig. 9-11) • Other types of phosphorylation are oxidation and (?) 1. Starts with PSII, radiant energy is absorbed 2. It must bump up electrons by absorbing a photon (energy particle; travels in waves) of light • Absorbs one photon for every electron it bumps up; 3. Pheophytin I is the complex that grabs electrons that are bumped up (found in the thylakoid membrane). 4. Next, the electrons are taken back down in energy by an energy cascade: plastoquinone cytochromes plastocynanine PS I • Enough energy is released on the cascade to make 1 ATP • The thylakoid membrane is chemiosmotic, hydrogen ions are bumped into the thylakoid space, ATP Synthase(protein complex)allows the protons to flow...
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This note was uploaded on 05/30/2008 for the course BS 131 taught by Professor Smith during the Spring '08 term at University of the Sciences in Philadelphia.

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Lecture 16 - Photosynthesis II – Stage of Photosynthesis

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