26. Consider the reaction of alcohol dehydrogenase. CH3-CH2OH + NAD+-+ CH,. CHO

Question

26. Consider the reaction of alcohol dehydrogenase. CH3-CH2OH + NAD+-+ CH,. CHO + NADH + H+ ethanol Which is the oxidizing agent? (2 pt) acetaldehyde a. Ethanol b. NAD c. Acetaldehyde d. NADH 27. Which of the following coenzymes is derived from riboflavin? (2 p) a. Coenzyme A b. NAD c. FAD d. a and b only e. All of the above. 28. Why is the conversion of NAD to NADH an example of reduction? (2 pt) a. the pyridine ring loses electrons (and a hydrogen) b. the pyridine ring gains electrons (and a hydrogen) c. the adenine ring loses electrons d. the adenine ring gains electrons e. None of the above (2 pt) 29. In the coenzyme FAD the site to which electrons are transferred is a. the ribose moiety of the molecule b. a purine ring system c. a pyrimidine ring system d. a nitrogen-containing ring system 30. The linking of an exergonic reaction to drive an endergonic reaction is called: (2 pt) a. coupling b. a state function c. resonance d, çatabolsim

Explanation / Answer

26.b.NAD+

27.c.FAD

FAD and FMN are two coenzymes derived from riboflavin.

28.d.the adenine ring gains electron.

29.d.a nitrogen-containing ring system.

30.a.coupling

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