Question 1

Which of the following best describes the role of B-vitamins in energy metabolism?

Accepted Answer

They serve as coenzymes that assist enzymes in the release of energy from macronutrients.

Question 2

A patient presents with fatigue and muscle weakness. Laboratory tests reveal a deficiency in vitamin B6. Which metabolic process is most likely impaired?

Accepted Answer

Glycogen breakdown and amino acid metabolism

Question 3

Which of the following minerals is a component of the antioxidant enzyme superoxide dismutase?

Accepted Answer

Zinc

Question 4

Choline is essential for which of the following physiological functions?

Accepted Answer

Synthesis of acetylcholine, a neurotransmitter

Question 5

Which equation best represents the process by which antioxidants neutralize free radicals?

Accepted Answer

$$ \mathrm{Antioxidant} + \mathrm{Free\ Radical} \rightarrow \mathrm{Oxidized\ Antioxidant} + \mathrm{Stable\ Molecule} $$

Question 6

A deficiency in which B-vitamin is most likely to result in the disease pellagra, characterized by dermatitis, diarrhea, and dementia?

Accepted Answer

Niacin (Vitamin B3)

Question 7

Which of the following best explains how oxidation can damage cells?

Accepted Answer

Oxidation produces free radicals that can damage DNA, proteins, and cell membranes.

Question 8

Which micronutrient is essential for the regeneration of vitamin E after it has neutralized a free radical?

Accepted Answer

Vitamin C

Question 9

A person with a diet deficient in selenium is at increased risk for which of the following?

Accepted Answer

Impaired antioxidant defense and increased cellular damage

Question 10

Which of the following best describes the role of vitamin A in vision?

Accepted Answer

It is a component of rhodopsin, necessary for low-light vision.

Question 11

Which of the following is a correct pairing of a B-vitamin and its primary metabolic function?

Accepted Answer

Thiamin (B1): Decarboxylation reactions in carbohydrate metabolism

Question 12

A patient with macrocytic anemia is most likely deficient in which of the following nutrients?

Accepted Answer

Folate (Vitamin B9)

Question 13

Which of the following minerals is essential for the function of the enzyme glutathione peroxidase?

Accepted Answer

Selenium

Question 14

Which of the following best describes the process of cell differentiation as influenced by vitamin A?

Accepted Answer

Vitamin A regulates gene expression, allowing cells to develop specialized functions.

Question 15

Which of the following carotenoids can be converted to vitamin A in the body?

Accepted Answer

Beta-carotene

Question 16

A person consumes a diet high in processed foods and low in fruits and vegetables. Which of the following is a likely consequence related to antioxidants?

Accepted Answer

Increased oxidative stress due to lower intake of antioxidant vitamins and phytochemicals

Question 17

Which of the following equations represents the conversion of pyruvate to acetyl-CoA, a process requiring several B-vitamins?

Accepted Answer

$$ \mathrm{Pyruvate} + \mathrm{CoA} + \mathrm{NAD}^+ \rightarrow \mathrm{Acetyl{-}CoA} + \mathrm{CO}_2 + \mathrm{NADH} $$

Question 18

Which of the following best explains why antioxidants are important in the diet?

Accepted Answer

They neutralize free radicals, reducing the risk of chronic diseases such as cancer and heart disease.

Question 19

Which mineral is required for the function of the antioxidant enzyme catalase?

Accepted Answer

Iron

Question 20

A patient with impaired fatty acid metabolism is found to have a deficiency in which B-vitamin, known for its role as a coenzyme in carboxylation reactions?

Accepted Answer

Biotin (Vitamin B7)

Nutrients Essential to Key Body Functions: Energy Metabolism, Antioxidants, and Micronutrient Roles

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