PracticeExam3_F11 - Name: _Practice Exam 3_ Date:...

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Name: __Practice Exam 3 __________________ Date: ___10-27-11 ___ Section I: 1 point each (23 points total) 1. O-linked oligosaccharides are commonly attached to the oxygen of _____. A) ribose B) tyrosine C) lysine D) threonine E) glycine 2. Which of the choices that follow would be an accurate classification of the carbohydrate structure below? A) aldopentose B) ketohexose C) aldotetrose D) aldotriose E) ketotetrose F) ketopentose 3. Unlike proteins and oligonucleotides, polysaccharides A) are readily metabolized in the absence of specialized enzymes. B) often have branched structures. C) are achiral. D) are always very water soluble. E) are components of every known living organism. 4. Bacterial cell walls are constructed of _____. A) pectin B) chondroitin sulfate chains C) peptidoglycans D) heparin E) all of the above 5. Consider the following metabolic reaction: Succinyl-CoA + Acetoacetate Acetoacetyl-CoA + Succinate Δ G °' = –1.25 kJ/mol This reaction is: A) favorable under standard conditions. B) not favorable under standard conditions. C) always exergonic and can never proceed in the opposite direction. D) spontaneous as written when [succinate] and [acetoacetyl-CoA] are high. E) None of the above 6. The process by which nutrients are degraded in order to salvage their components and/or to generate energy is most specifically called: A) glycolysis B) metabolism C) anaerobism D) catabolism E) anabolism 7. Glucose can be synthesized from noncarbohydrate precursors by______. A) biotin E) glucose-1-phosphate B) gluconeogenesis F) glucagon C) glucose-6-phosphatase G) glycogenolysis D) phosphorylase a Page 1
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Use the following to answer questions 8-9: 8. Which structures are glucoses? A) A B) A, B C) A, C D) A, B, C E) None of the above 9. Which is deoxyribose? A) A B) B C) C D) D E) None of the above 10. In glycogen synthesis, the intermediate between glucose-1-phosphate and glycogen is A) glucose-1,6-bisphosphate C) glucose B) glucose-6-phosphate D) UDP–glucose (or uridine diphosphate glucose) 11. In skeletal muscle cells, the NADH that is produced by glycolysis under anaerobic conditions (vigorous exercise) is regenerated to NAD + by the conversion of: A) lactate pyruvate B) phosphoenolpyruvate pyruvate C) pyruvate lactate D) glyceraldehyde-3-phosphate 1,3-bisphosphoglycerate E) acetaldehyde ethanol 12. Which of the following terms describes the citric acid cycle is referred to as being both catabolic and anabolic? A) cataplerotic B) amphibolic C) amphipathic D) anaplerotic Page 2
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Use the following to answer questions 13-14: 13. Which of the sugars shown in the figure are L sugars? A) A and B B) B and C C) C and D D) A and D E) None of the above 14. Which two sugars shown in the figure are epimers? A)
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PracticeExam3_F11 - Name: _Practice Exam 3_ Date:...

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