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Fiehn BIS103 lecture 02_fall 2010

Fiehn BIS103 lecture 02_fall 2010 - Summary 1st lecture...

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13 Summary 1 st lecture ‘Thermodynamics‘ Free Energies are additive + ATP + H 2 O ADP +P i -30.5 kJ/mol = -16.7 kJ/mol glucose-6P + H 2 O glucose + P i Δ G +13.8 kJ/mol HXK Δ G = Δ H-T Δ S Δ G o ’ = -RT ln K’ eq C 1 C 2 Side 1 Side 2 Δ G = RT ln K + z F ΔΨ Δ G o = -nF Δ E o Redox reactions Energy metabolism is burning fuel to store or use energy Oxidation / reduction and structures CH 3 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 3 C O 2 or O= C =O plus energy (heat) plus H 2 O + O 2 or O=O
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14 Energy metabolism is burning fuel to store or use energy In living cells, the same chemistry applies – but slowly and ordered! C O 2 or O= C =O plus energy (heat) plus water + O 2 or O=O CH 3 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 COOH COOH palmitic acid C16:0 C 16 H 32 O 2 Energy metabolism is burning fuel to store or use energy C O 2 or O= C =O plus energy (heat) plus water plus NH 3 + O 2 or O=O All sorts of chemicals can be burned – but the energy output is different! proteins barb2right amino acids e.g. Asparagine C 4 H 8 N 2 O 3 starch barb2right carbohydrates e.g. Glucose C 6 H 12 O 6
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15 Oxidation is ‘donating electrons’ Reduction is ‘accepting electrons’ What does oxidation mean? Old (wrong, outdated) definition still helps, in case you forget…. (oxidation ~ more oxygen atoms than before or less hydrogen than before a reaction. Reduction ~ more hydrogen than before or less oxygen atoms than before a reaction.). Better: oxidation states (http://en.wikipedia.org/wiki/Oxidation_state) Atoms in a molecule are compared with respect to their electronegativities. The more electronegative atom gets all electrons assigned.
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