Exam_2-06_key - Mid-term exam 2 BMB401 2006!Make sure you...

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1 Mid-term exam 2, BMB401, 2006 Kuo section !!!Make sure you fill in the correct form number!!! This one is FORM 1 4 points each Choose the best answer 1. Which of the following statements about allosteric regulation of enzymes are correct? (1) Enzymes regulated by the allosteric mechanism are usually multimeric. (2) When [S] >> Km, the regulation is likely a V system. (3) When [S] is about the same as Km, the regulation is likely a K system. (4) A hyperbolic curve of v vs. [S] is indicative of allosteric regulation. a. all are correct b. 1, 4 c. 4 d. 1, 2, 3 2. Which of the following are common enzyme regulation mechanisms? (1) Zymogens are converted to active enzymes by proteolytic digestion. (2) High concentration of substrate inhibits enzymes. (3) Control of enzyme abundance by regulating its expression. (4) Covalent modifications of the enzyme. (5) Increasing the product concentration speeds the reaction rate. a. 1, 2 b. 3, 5 c. 1, 3, 4 d. 2, 4, 5 3. Which of the four structures below is the most likely cyclization product of the sugar on the right? a. 1 b. 2 c. 3 d. 4 4. Which of the following statements about carbohydrates are correct? (1) Sucrose = Glucose- α -1,2-Fructose. (2) Lactose = Galactose- β -1,4-Glucose. (3) Cellulose is made of glucose repeating units joined by β -1,2 linkage within the backbone. (4) Chitin is composed of N-acetylglucosamine units joined by β -1,4 linkage. (5) Ribose is a ketopentose. a. 1, 2, 3 b. 1, 3, 5 c. 2, 3, 4 d. 1, 2, 4 CH 2 OH | C=O | HO-C-H | H-C-OH | HO-C-H | CH 2 OH CH 2 OH | | OH O | OH OH | | H H | CH 2 OH | | H CH 2 OH | H | | OH O | OH OH | | H H | H | | OH CH 2 OH | H | | OH O | H H | | OH OH | H | | OH CH 2 OH | | OH O | H H | | OH OH | CH 2 OH | | H (1) (2) (3) (4)
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2 5. Which of the following description about lipids is/are correct? (1) Linoleic acid [18:2(9,12)] has this structure: CH 3 -CH 2 -CH 2 -CH 2 -CH 2 -CH=CH-CH 2 -CH=CH-CH 2 -CH 2 -CH 2 -CH 2 -CH 2 -CH 2 -CH 2 -COOH (2) Oleic acid [18:1(9)] has this structure: CH 3 -CH 2 -CH 2 -CH 2 -CH 2 -CH 2 -CH 2 -CH 2 -CH=CH-CH 2 -CH 2 -CH 2 -CH 2 -CH 2 -CH 2 -CH 2 -CH 2- COOH (3) The structure on the right represents a glycerophospholipid a. 1, 2 b. 1 c. 2, 3 d. 1, 2, 3 6. Select the correct statement(s). (1) Steroid hormones and bile acids are derived from cholesterol. (2) Glucocorticoid hormones control salt balance. (3) Glycosphingolipids are important energy storage lipids for nervous tissues. a. 1 b. 3 c. 2, 3 d. 2 7. Select the correct statement about glycogen and starch? a. Glycogen is enriched in connective tissues of animals. b. The branching point of glycogen is formed by a glucose-
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Exam_2-06_key - Mid-term exam 2 BMB401 2006!Make sure you...

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