B1510_module3_5_respiration (1)

B1510_module3_5_respiration (1) - Georgia Tech School of...

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Unformatted text preview: Georgia Tech School of Biology Fall 2011 Biology 1510 Georgia Tech School of Biology Fall 2011 Biology 1510 An evolutionary approach to learning energy metabolism How do cells obtain energy from food? Redox reactions How do cells make ATP? Chemiosmosis and oxidative phosphorylation What metabolic pathways were present in the LUCA? Pathways common to all 3 domains Pathways in organisms that live in environments resembling early Earth Georgia Tech School of Biology Fall 2011 Biology 1510 Oxidation-reduction is the core of energy metabolism O xidation i s the l oss of electrons Organic molecules (food) and inorganic chemical electron donors are oxidized R eduction i s the g ain of electrons The amount of free energy released depends on the reduction potential difference of the redox pair Catabolic pathways feature a series of redox reactions (electron-transfer reactions) NAD+/NADH is the primary electron carrier Georgia Tech School of Biology Fall 2011 Biology 1510 F r e e e n e r g y , G F r e e e n e r g y , G (a) Uncontrolled reaction H 2 O H 2 + 1 / 2 O 2 Explosive release of heat and light energy (b) Cellular respiration Controlled release of energy for synthesis of ATP 2 H + +...
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B1510_module3_5_respiration (1) - Georgia Tech School of...

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