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BIBC HW 3 Sol - Metabolic Biochemistry Summer 2010 Homework...

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Metabolic Biochemistry KEY Summer 2010 Homework 3 (40 pts.) 1) (7 pts.) Use the diagram below to answer the following questions about the reaction mechanism for the pyruvate dehydrogenase complex. a. On hydroxyethyl-TPP, circle the chemical group that gets oxidized in the following step. b. Which enzyme catalyzes the oxidation step in part (a) above? E 1 or E 2 or E 3 c. Draw the structure of the chemical group that is attached to lipoyllysine here. d. Is this form of lipoyllysine oxidized or reduced? reduced e. Write in both forms of the missing electron carrier in the box (not the structure). f. Is this form of lipoyllysine oxidized or reduced? _ oxidized g. This kind substrate transfer through multiple enzyme subunits and their coenzymes is known as substrate channeling . a. f. NADH NAD + e. d. c.
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2) (8 pts.) A test electrode contains a solution of ubiquinone, with both the fully oxidized and fully reduced forms, at 1 M concentration each. A circuit is formed from this electrode using a KCl solution salt bridge with a standard hydrogen electrode (25°C, 1 ATM H 2 , 1 M H + ). When this circuit is complete, a current of electrons pass to the ubiquinone test cell at +0.045 volts. a. What is the standard reduction potential (E°’) of ubiquinone? 0.045 volts The description given above is the definition of reduction potential. b. Which has a higher standard reduction potential, ubiquinone or oxygen? Oxygen. Oxygen is the final electron acceptor at the ‘bottom’ of the electron transport chain, therefore it has the highest reduction potential.
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