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Chap20 Enzymes and vitamins - Chapter 20 Enzymes and...

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Chapter 20 Enzymes and Vitamins 20.1 Multiple - Choice Questions 1) To what main class of enzymes does the enzyme that catalyzes the conversion of lactose to galactose and glucose belong? A) oxidoreductase B) transferase C) hydrolase D) lyase E) isomerase Answer: C 2) To what main class of enzymes does the enzyme that catalyzes the following reaction belong? O OH CH3 C COO - CH3 C HCOOA) oxidoreductase B) transferase C) hydrolase D) lyase E) isomerase Answer: A 3) To what main class of enzymes does the enzyme that catalyzes the following reaction belong? ser - ala ser + ala 4) Compared to an uncatalyzed reaction, an enzyme - catalyzed reaction 5) Which of the following is NOT a step in the enzyme - catalyzed conversion of a substrate to product? 6) The formation of an enzyme - substrate complex is the ________ step in enzyme action. A) first B) second C) third D) fourth E) last Answer: A 7) The active site of an enzyme
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8) The water - soluble B and C vitamins supply 9) The optimum temperature for sucrase activity is 37°C. The hydrolysis of sucrose is slowest at which temperature in the choices below? 10) Which of the following is NOT true for a competitive inhibitor? A) It occupies the active site. B) It cannot be converted to products. C) It has a structure similar to the substrate. D) Increasing the substrate concentration can reverse competitive inhibition. E) It binds to the enzyme at a site remote from the active site. Answer: E
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