Question

1. When humans consume alcoholic beverages, the enzyme alcohol dehydrogenase catalyzes the conversion of ethanol to acetaldehyde. Acetaldehyde is then metabolized to acetate, catalyzed by the aldehyde dehydrogenase enzyme. The coenzymes NAD+/NADH are required for both steps (NAD = nicotinamide adenine dinucleotide). The two-step conversion of ethanol to acetate is shown below. Considering the structures shown, answer the following questions. (HINT: refer to Chapter section 10.8 in McMurry on oxidation-reduction in organic molecules.) alcohol dehydrogenase aldehyde dehydrogenase OH ethanol acetaldehyde acetate NAD+ NADH + H+ NAD+ NADH + H+ a. Is ethanol oxidized or reduced when it is converted to acetaldehyde? b. Is acetaldehyde oxidized or reduced when it is converted to acetate? c. Is NAD+ oxidized or reduced when converted to NADH?

          1. When humans consume alcoholic beverages, the enzyme alcohol dehydrogenase catalyzes the conversion of ethanol to acetaldehyde. Acetaldehyde is then metabolized to acetate, catalyzed by the aldehyde dehydrogenase enzyme. The coenzymes NAD+/NADH are required for both steps (NAD = nicotinamide adenine dinucleotide). The two-step conversion of ethanol to acetate is shown below. Considering the structures shown, answer the following questions. (HINT: refer to Chapter section 10.8 in McMurry on oxidation-reduction in organic molecules.)

alcohol dehydrogenase
aldehyde dehydrogenase
OH
ethanol
acetaldehyde
acetate
NAD+
NADH + H+
NAD+
NADH + H+

a. Is ethanol oxidized or reduced when it is converted to acetaldehyde?

b. Is acetaldehyde oxidized or reduced when it is converted to acetate?

c. Is NAD+ oxidized or reduced when converted to NADH?

1. When humans consume alcoholic beverages, the enzyme alcohol dehydrogenase catalyzes the conversion of ethanol to acetaldehyde. Acetaldehyde is then metabolized to acetate, catalyzed by the aldehyde dehydrogenase enzyme. The coenzymes NAD+/NADH are required for both steps (NAD = nicotinamide adenine dinucleotide). The two-step conversion of ethanol to acetate is shown below. Considering the structures shown, answer the following questions. (HINT: refer to Chapter section 10.8 in McMurry on oxidation-reduction in organic molecules.)

alcohol dehydrogenase
aldehyde dehydrogenase
OH
ethanol
acetaldehyde
acetate
NAD+
NADH + H+
NAD+
NADH + H+

a. Is ethanol oxidized or reduced when it is converted to acetaldehyde?

b. Is acetaldehyde oxidized or reduced when it is converted to acetate?

c. Is NAD+ oxidized or reduced when converted to NADH?

Added by Kathleen F.

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