pg 6.jpeg - answers nucleotides 6 of 6 synthesis of lipids glycolysis citric acid cycle 7(7 pts If glucose-6-phosphate is labeled with radioactive 14C

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Unformatted text preview: answers nucleotides 6 of 6 synthesis of lipids glycolysis citric acid cycle 7. (7 pts) If glucose-6-phosphate is labeled with radioactive 14C isotope at its C3 position, where will the label appear in pyruvate? DRAW pyruvate and CIRCLE the 14C. C= 0 CH2 5 NAME Key Question 18. (5 pts) Use numbers to indicate the order of steps in the pyruvate dehydrogenase complex: 1 Decarboxylation of pyruvate to an aldehyde Regeneration of the oxidized FAD cofactor Formation of acetyl CoA Oxidation of aldehyde to the level of a carboxylic acid Reoxidation of the lipoamide cofactor Question 19. (3 pts) We can measure the rate of reaction for some dehydrogenases by measuring changes in the absorbance of the reaction mixture at 450nm in a spectrophotometer. What molecule is changing in absorbance in this reaction? Circle the correct choice. glucose ( FAD) pyruvate fructose amino acids Question 20. (8pts, 2pts each) We can store glucose as polymer called glycogen in the liver and muscles. We use several enzymes to release glucose monosaccharides for use by our cells. Answer the following questions about glycogen breakdown: glycogen? a) What is the enzyme that removes 1 glucose subunit from the nonreducing end of glycogen phosphorylase b) The enzyme in part a is not a hydrolase, because it adds what molecule to glucose to make glucose 1-phosphate? inorganic phosphate c) In order to enter glycolysis, the glucose 1-phosphate is then converted to what molecule? glucose 6- phosphate d) What type of enzyme catalyzes the reaction in part c? mutase hexokinase aldolase dehydrogenase Question 21. (8 pts, 4 pts each) Draw the structures of the two products of the enzyme bypass). in gluconeogenesis that replaces the glycolytic enzyme phosphofructokinase (2nd CHOPog 2- =0 -O - P . " NO PHZON OH...
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  • Spring '11
  • Nicholas
  • Exam #3

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