Thylakoids plants pigments embedded in thylakoid

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Unformatted text preview: nts in Photosynthesis • Bacteria – Pigments in plasma membranes • Pockets or “thylakoids” in PM! thylakoids” • Plants – Pigments embedded in thylakoid membrane thylakoid system – Pigments and proteins organized into photosystems photosystems – Photosystems located next to electron electron transport systems transport Thylakoid Membrane Section: Photosystems & Electron Transporters Photosystems stroma thylakoid membrane thylakoid compartment ATP SYNTHASE water-splitting complex waterH2O Light P680 2H+ + 1/2O2 H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ P700 PHOTOSYSTEM II reaction center pool of electron transporters PHOTOSYSTEM I reaction center electron acceptor first electron transfer chain electron second electron acceptor transfer chain 4 II. Light-Dependent Reactions 1. Pigments absorb light energy, • give up e- , which enter electron transport systems 2. Water molecules are split (Photolysis), • ATP and NADH are formed, and oxygen is released 3. Pigments that gave up electrons get replacements (…cycle continues…) Photosystem Function: Reaction Center 1. Energy is reduced to level 1. that can be captured by molecule of chlorophyll a chlorophyll Pigm...
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This document was uploaded on 03/18/2010.

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