Exam-3-2010-key-post_41911

Exam-3-2010-key-post_41911 - Exam 3 BCHS 3305 Spring 2010...

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Exam 3 BCHS 3305 Spring 2010 ID#___________________ Name____________________ There are 25 multiple choice (p1-5) and 5 short answer (p6-10) questions. Answer all questions. Multiple choice, 2 pts. each. Total 50 pts 1. Diabetics often suffer ______, a condition in which acetoacetate levels increase, causing a sweet breath odor. A. Atherosclerosis B. Lipidosis C. Glyceroneogenesis D. Ketosis E. Sphingolipid storage disease 2. Isoprene units form the carbon skeleton of ______. A. Phosphopantetheine B. Acyl carrier protein C. Cholesterol D. NADPH E. Chylomicrons 3. Of the ______ reactions in the urea cycle, ______ is/are mitochondrial and ______ is/are cytosolic. A. 5, 3, 2 B. 5, 2, 3 C. 5, 1, 4 D. 5, 4, 1 E. 5, 0, 5 4. Two phosphatidylglycerol molecules condense to form the molecule ______, and glycerol is eliminated as the side product. A. Phosphatidic acid B. Cardiolipin C. Plasmalogen D. Sphingomyelin E. Squalene 1
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Exam 3 BCHS 3305 Spring 2010 5. In which cellular compartment does the following reaction take place? HMG-CoA Æ acetoacetate + Acetyl-CoA A. Cytosol B. Mitochondrial matrix C. Thylakoid lumen D. Chloroplast stroma E. Outside the cell 6. In which cellular compartment does the following reaction take place? HMG-CoA + 2 NADPH Æ mevalonate + 2 NADP + + Acetyl-CoA A. Cytosol B. Mitochondrial matrix C. Thylakoid lumen D. Chloroplast stroma E. Outside the cell 7. Which enzyme catalyzes the key regulatory step of cholesterol synthesis? A. β -ketothiolase B. HMG-CoA synthase C. HMG-CoA reductase D. Mevalonate kinase E. Squalene monooxygenase 8. Which coenzyme is utilized by the enzyme acetyl-CoA carboxylase? A. Thiamine pyrophosphate B. Biotin C. Cyanocobalamin [vitamin B 12 ] D. Pyridoxal phosphate E. S -Adenosylmethionine 9. An important structural lipid found in nerve cell membranes, ______, is a type of ______. A. Sphingomyelin, Phospholipid B. Phosphatidylcholine, Phospholipid C. Palmitate, Glycerophospholipid D. Glucagon, Hormone E. None of the above 2
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Exam 3 BCHS 3305 Spring 2010 10. Which statement concerning phospholipid synthesis is true? A. Addition of polar “head groups” to diacylglycerol usually involves CDP adducts. B. Addition of polar “head groups” to diacylglycerol usually involves UDP adducts. C. Addition of fatty acyl “tails” to glycerol usually involves CDP adducts. D. Addition of fatty acyl “tails” to glycerol usually involves UDP adducts. E. None of the above are true. 11. Aminotransferases utilize a coenzyme synthesized from ______. A. Vitamin B1 B. Vitamin B2 C. Vitamin B6 D. Vitamin B7 E. Vitamin B12 12. Proteins can be marked for degradation by being covalently linked to ______. A.
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This note was uploaded on 09/15/2010 for the course BCHS 3305 taught by Professor Fujita during the Spring '10 term at University of Houston.

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Exam-3-2010-key-post_41911 - Exam 3 BCHS 3305 Spring 2010...

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