sp07 final exam

sp07 final exam - 1 FINAL EXAM, Biochemistry 102/2007 I....

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1 FINAL EXAM, Biochemistry 102/2007 I. ( 25 points ) Fill in all of the enzyme catalyzed reactions which convert the substrate on the left to the product on the right. Draw the correct structure for each intermediate molecule. Include the names or abbreviations of any other reactants and products (e.g., ATP, ADP, P i , NAD + , NADH, etc.), and any required prosthetic groups (e.g., TPP, FAD, biotin, etc.). Identify the reaction catalyzed by acetyl CoA carboxylase. (A) Acetyl CoA (cytosol) CH 3 CH 2 CH 2 C(O)–SACP (B) Name the coenzyme from which the prosthetic group of acyl carrier protein is derived. Describe the essential role of this prosthetic group with the aid of a diagram of the fatty acid synthase complex.
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2 II . (45 points ) Fill in all enzyme catalyzed reactions needed to convert the substrate on the left to the product on the right. Draw the correct structure for each intermediate molecule. Include the names or abbreviations of any other reactants and products (e.g., ATP, ADP, P i , NAD + , NADH, etc.), and any required prosthetic groups (e.g., TPP, FAD, biotin, etc.). (A) Pyruvate (gluconeogenesis in liver) ( Indicate which steps occur in the matrix and which occur in the cytosol.) Phosphoenol pyruvate (draw) ------------------------------------------------------------------------------------------------------ (B) Glucose (glycogen synthesis in the liver) (Show the point on the glycogen polymer to which the entering glucose attaches.) (Glucose) n (Glucose) n+1
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3 (C) citrate in cytosol (FAB) pyruvate in cytosol --------------------------------------------------------------------------------------------------------------------------- (D) (for this part only, the correct names of intermediate molecules receives full credit) Glucose-6-phosphate Ribose-5-phosphate
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4 III. (20 points) In the space below please draw all of the enzymatic reactions needed to convert the amino nitrogen of alanine to a nitrogen of urea. Assume that your starting materials are alanine, α -ketoglutarate, aspartate, arginine , and bicarbonate . Draw the correct structure for each intermediate molecule ( if you don’t know the structure, give the correct name to receive partial credit ). Include the names or abbreviations of any other reactants and products (e.g., ATP, ADP, Pi, NAD + , FAD, NADH, etc.), any required cofactors (e.g., biotin, TPP, etc.)
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5 IV. (10 points) Answer one of the following two problems. Please cross out the one that you don't wish to have graded. A. Outline the steps starting with a decrease in blood glucose on the left and ending with the relevant changes in the activities of glycogenolysis and gluconeogenesis in the liver on the right. Use arrows ( ↑ or ) to show the effect on messenger molecule concentration, enzyme activity, and pathway activity at each step, as in the lecture handout “Responses in liver cells when blood glucose levels are low.” B. Give a simple diagram that shows the inter relationship between photosynthesis and respiration (the lecture handout ‘The electron cycle of life” will receive full credit).
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This test prep was uploaded on 04/07/2008 for the course BIBC 102 taught by Professor Price during the Spring '02 term at UCSD.

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sp07 final exam - 1 FINAL EXAM, Biochemistry 102/2007 I....

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