Photosynthesis Today s topics: Metabolism of various • Finish Cellular Respiration molecules • Leaves and Chlorophyll
• How light energy is captured – light reactions produce ATP and NADPH – Photosystems 1 and 2 The arrows go both directions • How sugars are made – “dark” reactions reduce CO2 to sugars Oct 11, 2021 – Calvin cycle 1
Glucose AMP Photosynthesis H O The control of Glycolysis 2 CO2 Fructose-6-phosphate Stimulates + cellular Phosphofructokinase – – Light energy Fructose-1,6-bisphosphate respiration Inhibits Inhibits NADP+
ADP + LIGHT P i CALVIN Pyruvate REACTIONS CYCLE
ATP Citrate ATP Acetyl CoA Thylakoid Stroma NADPH
Citric acid cycle Chloroplast
O2 [CH2O] (sugar) Oxidative phosphorylation
Figure 9.2 Chloroplast Mesophyll Cell Light Leaf cross section energy Vein Chloroplast
ECOSYSTEM Mesophyll
Photosynthesis 5 µm
in chloroplasts CO2 O CO + H O Organic Stomata 2 2 2 molecules+ O2 Cellular respiration in mitochondria
Outer membrane
Thylakoid Intermembrane space
Stroma Inner ATP powers membrane ATP most cellular work
Heat energy 6
1 µm
1 Chlorophyll molecules are embedded in the thylakoid membrane
Light Reactions (energy capture)