Chloroplasts - Light reactions occur in thylakoid membrane...

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Chloroplasts 1. Chloroplasts are members of the plastid family of organelles 2. Chloroplast structure 3. Chloroplast function 4. Transport of proteins into chloroplasts
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Plastid family Plastid is an organelle in living plant cells that contains a small genome nad has a double membrane Several different types Etioplasts Leucoplasts Amyloplast Chloroplasts are most common
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Chloroplast structure Lens shaped organelles 2-4 um x 4-7 um Double membrane system that divides into three functional compartments Intermembrane space Thylakoid spaces Grana Stroma
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Chloroplast Function Photosynthesis Net equation = 6 CO 2 + 6 H 2 O --> C 6 H 12 O 6 + 6O 2 Light reactions Light energy is converted to chemical bond energy Dark reactions – Reduction of CO 2 to carbohydrate
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Photosynthesis
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Unformatted text preview: Light reactions occur in thylakoid membrane Dark reactions occur in the stroma Light Reactions Reduce NADP + to NADPH Give off O 2 as a byproduct Generate ATP Dark Reactions Incorporates atmospheric CO2 into ribulose 1,5-bisphosphate Catalyzed by RuBP carboxylase Calvin cycle uses 18 ATP and 12 NADPH and produces 1 glucose Chloroplast protein transport Similarities with mitochondrial transport Posttranslational Separate translocators in each membrane Requires energy Uses an amphipathic signal Differences with mitochondrial transport Uses GTP and ATP Actual proteins are different Proteins destined for thylakoid have two sequences Thylakoid Import...
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Chloroplasts - Light reactions occur in thylakoid membrane...

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