BioChemistry > EXAM > Biochemistry exam | topic wise correctly answered questions | 16 pages (All)

Biochemistry exam | topic wise correctly answered questions | 16 pages

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: Fatty Acids 1. Which of the following fatty acids does not possess a double bond? Proprionic 2. What type of reaction does lipase perform? Hydrolysis 3. Upon exposure to glucagon, what is the phosphorylation state and activity of Triacylglycerol Lipase? Phosphorylated, active 4. Glycerol phosphate dehydrogenase performs what type of reaction? Oxidation 5. In many CoA reactions, the energy for the reaction comes from the thioester bond of the CoA. However, in charging CoA with a fatty acyl, what provides the energy? Phosphoryl Transfer 6. The second step of B-oxidation, performs what type of chemical reaction? Hydration 7. Consider a fatty acyl of 16 carbons that is attached to CoA. The carbon bonded to CoA is radioactively labelled. How many cycles of B-oxidation must occur before a radio labeled acetyl CoA appears? 1 8. Which of the following enzymes will provide NADPH for palmitate synthesis? Malic Enzyme 9. What chemical change occurs to acetyl CoA in order to be converted to malonyl CoA? Carboxylation 10. In a person with active fatty acid synthesis which of the following is likely true? (select all that apply) Hormone sensitive lipase active is decreased Malic enzyme is elevated Insulin is elevated Quiz: Cholesterol and Phospholipids 1. An isomerization of isopentyl pyrophosphate results in what? Dimethylallyl pyrophosphate 2. A newborn infant is born prematurely. The lecithin/ sphingomyelin ration is 1.3. What is the likelihood this child will show respiratory distress syndrome? 75% 3. Since the basic structure of cholesterol has a phosphor-group the molecule is amphipathic. False 4. Which of the following is the primary product of the rate-limiting step of cholesterol biosynthesis? Mevalonate 5. Given the action of pyrophosphomevalonate decarboxylase, what might be one of the products? Carbon dioxide 6. Farnesyl pyrophosphate combines with what to form squalene? Farnesyl pyrophosphate 7. Which of the following is used to regulate the rate-limiting enzyme of cholesterol biosynthesis? (select all that apply) Rate of translation Half life of the enzyme Rate of transcription Phosphorylation status Feedback inhibition 8. Converting 7-dehydrocholesterol to vitamin D3 requires the enzyme Dehydrocholesterol Lyase. False 9. What is the primary building block of cholesterol biosynthesis? Isopentenyl Pyrophosphate

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