Bio Notes Chapter 8 - Chapter 8 Photosynthesis Autotroph:...

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Chapter 8 – Photosynthesis Autotroph: makes organic molecules from inorganic sources. Photoautotroph: uses light as an energy source. Photosynthesis in plants CO 2 + H 2 O + light energy CH 2 O + O 2 CO 2 is reduced (gains electrons) H 2 O is oxidized (loses electrons) Chloroplasts are the semiautonomous organelle found only in planes/algae. Chloroplasts: 2 outer membranes Thylakoid Membrane (folded & unfolded) Thylakoids Thylakoid Membrane: Probably a single, highly folded membrane that encloses a continuous lumen. -contains pigment molecules -site of light reaction Stroma: -the fluid filled region surrounding Thylakoids - the site of the dark reactions / Calvin cycle
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Pigments: molecules that absorb light energy Chlorophyll: Central Mg +2 ion in a porphyrin ring. Delocalized electrons in this ring absorb light energy. C,H tail anchors it to the membrane proteins Fig 8.4 light absorption boosts electrons in porphyrin ring to higher energy levels Stroma – pigments associate with Thylakoid membrane proteins & forms 2 kinds of
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This note was uploaded on 04/07/2008 for the course BISC 207 taught by Professor Skopik during the Fall '07 term at University of Delaware.

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Bio Notes Chapter 8 - Chapter 8 Photosynthesis Autotroph:...

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