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tutorial5_ans - Biochem 300 -Tutorial 5 July 23rd 2009...

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Biochem 300 -Tutorial 5 July 23 rd 2009 Topics: E.T.C., glycogen storage and gluconeogenesis, lipids
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1. [Problem Set] Given the following table of standard reduction potentials: Calculate the change in Gibb’s free energy that results from transferring two electrons from QH 2 to O 2 .
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1. answer. NADH → Complex I → Q (ubiquinone) → Complex III → cytochrome c → Complex IV → O 2 ΔG ο ` = -nFΔE ο ` F = 96.48kJ/mol ΔE ο ` = E ο ` (e acceptor) - E ο ` (e donor)
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we could look at all the intermediates, but we don’t really need to, we can just look at the final acceptor and the initial donor. acceptor -> O 2 Donor -> QH 2 ΔE ο ` = E ο ` (e acceptor) - E ο ` (e donor) = E ο ` (O2) - E ο ` (QH2) = 0.820V – 0.045V = 0.775V ΔG ο ` = -nFΔE ο ` = -(2)(96.5x10 3 C/mol)(0.775 J/C) = -150 kJ/mol (in class we went from NADH to O2 and that was -220
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following scenario: A sample of glycogen from a patient with liver disease is incubated with orthophosphate, phosphorylase, the transferase, and the debranching enzyme (α1-6-glucosidase). The ratio of glucose 1-
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tutorial5_ans - Biochem 300 -Tutorial 5 July 23rd 2009...

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