Q: Which of the following correctly describes the sequence of oxidation reactions that occur when ethanol is metabolized in the liver?

$$\text{Ethanol} \rightarrow \text{Acetaldehyde} \rightarrow \text{Acetic acid}$$

Q: Which of the following best represents the oxidation reaction from acetaldehyde to acetic acid?

$$\text{CH}_3\text{CHO} + \text{NAD}^+ \rightarrow \text{CH}_3\text{COOH} + \text{NADH} + \text{H}^+$$

Q: Which of the following is the correct chemical equation for the oxidation of ethanol to acetaldehyde?

$$\text{CH}_3\text{CH}_2\text{OH} + \text{NAD}^+ \rightarrow \text{CH}_3\text{CHO} + \text{NADH} + \text{H}^+$$

Question 1

Which of the following correctly describes the sequence of oxidation reactions that occur when ethanol is metabolized in the liver?

Accepted Answer

$$	ext{Ethanol} ightarrow 	ext{Acetaldehyde} ightarrow 	ext{Acetic acid}$$

Question 2

Which enzyme is primarily responsible for converting ethanol to acetaldehyde in the human liver?

Accepted Answer

Alcohol dehydrogenase

Question 3

Why is the accumulation of acetaldehyde in the body considered toxic?

Accepted Answer

It can cause tissue damage and is associated with hangover symptoms.

Question 4

Which of the following best represents the oxidation reaction from acetaldehyde to acetic acid?

Accepted Answer

$$	ext{CH}_3	ext{CHO} + 	ext{NAD}^+ ightarrow 	ext{CH}_3	ext{COOH} + 	ext{NADH} + 	ext{H}^+$$

Question 5

A patient with a genetic deficiency in aldehyde dehydrogenase is likely to experience which of the following after consuming alcohol?

Accepted Answer

Increased acetaldehyde levels and severe hangover symptoms

Question 6

Which of the following is the correct chemical equation for the oxidation of ethanol to acetaldehyde?

Accepted Answer

$$	ext{CH}_3	ext{CH}_2	ext{OH} + 	ext{NAD}^+ ightarrow 	ext{CH}_3	ext{CHO} + 	ext{NADH} + 	ext{H}^+$$

Question 7

Which of the following statements best explains why acetaldehyde is more toxic than ethanol or acetic acid?

Accepted Answer

Acetaldehyde is highly reactive and can form adducts with proteins and DNA, leading to cellular damage.

Question 8

In the context of alcohol metabolism, what is the primary role of acetic acid after it is formed from acetaldehyde?

Accepted Answer

It enters the citric acid cycle to be further metabolized for energy.

Question 9

A person consumes a large amount of alcohol in a short period. Which of the following is most likely to occur if their aldehyde dehydrogenase activity is low?

Accepted Answer

Acetaldehyde will accumulate, leading to flushing, nausea, and rapid heartbeat.

Question 10

Which of the following best describes the fate of ethanol in the liver?

Accepted Answer

It is oxidized to acetaldehyde, then to acetic acid, and finally enters the citric acid cycle.

Question 11

Which of the following is a likely consequence of chronic acetaldehyde buildup in the liver?

Accepted Answer

Liver damage due to protein and DNA adduct formation

Question 12

Which of the following best explains why some individuals experience more severe hangover symptoms after drinking alcohol?

Accepted Answer

They have a genetic variation that reduces aldehyde dehydrogenase activity, leading to acetaldehyde accumulation.

Question 13

Which of the following is NOT a product of ethanol oxidation in the liver?

Accepted Answer

Methanol

Question 14

If a drug inhibits alcohol dehydrogenase, what would be the expected effect on ethanol metabolism?

Accepted Answer

Ethanol would accumulate in the body, and less acetaldehyde would be produced.

Question 15

Which of the following best describes the role of NAD$$^+ in $$the oxidation of ethanol?

Accepted Answer

It acts as an oxidizing agent, accepting electrons during the conversion of ethanol to acetaldehyde.

Ethanol Metabolism and Toxicity: Alcohols, Aldehydes, and Acids

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