Pretest4

Pretest4 - BCH 4054 November 3, 2000 PRE-TEST 4 GROUP NAME...

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November 3, 2000 PRE-TEST 4 GROUP NAME ___________________ This test is take-home and open book, and it is intended that all members of the group contribute to completing it. Only one copy is to be submitted by the group, and all members who participated should sign their names below. Test is due on Monday, November 13. Please use dark pencil or ink and write legibly . ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ ________________________________ Page Points 1 ______ 2 ______ 3 ______ 4 ______ 5 ______ Total ______ Points (12) 1. When muscle breaks down protein as an energy source, it must dispose of the nitrogen produced in the oxidation of the amino acids. (a) Describe two mechanisms by which the nitrogen can be transported to liver. (b) Once in the liver, conversion of the nitrogen to ammonia requires the input of energy. Give the reactants, products, and names of the enzymes that utilize ATP, and calculate the ATP cost for each N converted to urea. (c) Removal of N from amino acids results in formation of one NADH, however, whether done by glutamate dehydrogenase or conversion of fumarate to oxaloacetate in the urea cycle. Assuming these steps occur in mitochondria, and that each NADH could generate 2.5 ATP's, what then would be the net ATP balance in converting an amino acid N to urea. (4)
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This note was uploaded on 05/22/2011 for the course BCH 4054 taught by Professor Logan/gilmer during the Spring '06 term at FSU.

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Pretest4 - BCH 4054 November 3, 2000 PRE-TEST 4 GROUP NAME...

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