Exam_2-07_key - Form 1 - Kaguni Exam 2 Mid-term exam 2,...

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Form 1 - Kaguni Exam 2 Mid-term exam 2, BMB401, 2007 Kuo section 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) The effector is most likely to control the Vmax of the target enzyme if the physiological concentration of S is much greater than the Km of the enzyme. (3) If a physiological concentration of S is about the same as Km, the regulation is likely a K system. (4) A hyperbolic v vs. [S] curve is indicative of allosteric regulation. a. 1, 2, 3, 4 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 feeds back to inhibit the enzyme. (3) Control of enzyme abundance by regulating its expression. (4) Enzyme activity is controlled by a post-translational modification. (5) Increasing the product concentration accelerates the reaction. a. 1, 2 b. 3, 5 c. 1, 3, 4 d. 2, 4, 5 3. Which of the following best depicts the α -pyranose form of this sugar: THIS QUESTION WAS DISCARDED. a. 1 b. 2 c. 3 H-C-OH HO-C-H HO-C-H H-C-OH CH 2 OH COH HO O C OH OH OH C C C C CH 2 OH HO O C HO HO OH C C C C CH 2 OH HO O C OH OH OH C C C C CH 2 OH HO C C OH OH C C C C HO 1 2 3 4
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Form 1 - Kaguni Exam 2 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) Glycogen is made of glucose repeating units joined by α -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 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 is a glycerophospholipid a. 1, 2 b. 1 c. 2, 3 d. 1, 2, 3 6. Phosphatidylcholine is a. a common biological membrane component. b. an important neurotransmitter. c. a glycolipid. d. having fatty acids forming phosphoester bonds at C1 and C2 position. HO-CH 2 -CH=CH-(CH 2 ) 12 -CH 3 | CH-NH-C-stearic acid | CH 2 -O-phosphorylcholine O
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Form 1 - Kaguni Exam 2 7. Food rich in which of these fatty acids is good for our health? a. 2
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Exam_2-07_key - Form 1 - Kaguni Exam 2 Mid-term exam 2,...

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