Question 1

Which of the following best explains why fat-soluble vitamins (A, D, E, K) require the presence of dietary fat for absorption?

Accepted Answer

Fat-soluble vitamins are incorporated into micelles with dietary fat, which facilitates their absorption in the small intestine.

Question 2

A patient with a very low intake of dietary fat is most at risk for deficiency in which group of vitamins?

Accepted Answer

Vitamins A, D, E, and K

Question 3

Which of the following foods is a good source of preformed vitamin A (retinol)?

Accepted Answer

Egg yolks

Question 4

Vitamin D is unique among vitamins because:

Accepted Answer

It can be synthesized in the skin upon exposure to sunlight.

Question 5

Which of the following is NOT a function of vitamin D?

Accepted Answer

Acting as an antioxidant.

Question 6

A child who rarely goes outside and eats very little fish or dairy products is most at risk for developing which deficiency disease?

Accepted Answer

Rickets

Question 7

Which of the following processes requires vitamin E?

Accepted Answer

Preventing damage to cell membranes by neutralizing free radicals.

Question 8

Why should patients taking anticoagulants carefully monitor their vitamin K intake?

Accepted Answer

Vitamin K is required for the synthesis of clotting factors, which could decrease the effectiveness of anticoagulants.

Question 9

Which vitamin acts as an antioxidant, neutralizing free radicals and protecting cell membranes from damage?

Accepted Answer

Vitamin E

Question 10

A patient is prescribed both vitamin E and vitamin K supplements. Why might this combination be problematic?

Accepted Answer

Vitamin E can inhibit the blood coagulation function of vitamin K, increasing bleeding risk.

Question 11

Which of the following best describes the storage of fat-soluble vitamins in the body?

Accepted Answer

They are stored in the liver and adipose tissue, making toxicity more likely with excessive intake.

Question 12

Which of the following is a symptom of vitamin K deficiency?

Accepted Answer

Impaired blood clotting

Question 13

Which vitamin is most directly involved in the regulation of calcium and phosphorus absorption in the intestine?

Accepted Answer

Vitamin D

Question 14

A person who eats a diet very high in polar bear liver is at risk for toxicity of which vitamin?

Accepted Answer

Vitamin A

Question 15

Which of the following statements about fat-soluble vitamins is TRUE?

Accepted Answer

They are stored in the liver and adipose tissue, so deficiency symptoms may take longer to appear.

Question 16

Which vitamin is essential for the synthesis of blood clotting proteins?

Accepted Answer

Vitamin K

Question 17

A deficiency in which vitamin is most likely to result in night blindness?

Accepted Answer

Vitamin A

Question 18

Which of the following equations best represents the relationship between vitamin D, calcium, and bone health?

Accepted Answer

$$Vitamin\ D \xrightarrow{increases} Calcium\ Absorption \xrightarrow{promotes} Bone\ Mineralization$$

Question 19

Which of the following best describes the difference between preformed vitamin A and provitamin A carotenoids?

Accepted Answer

Preformed vitamin A is found in animal foods and is ready for use by the body, while provitamin A carotenoids are found in plant foods and must be converted to active vitamin A.

Question 20

A patient with a genetic disorder that impairs fat absorption is most likely to develop deficiencies in which vitamins?

Accepted Answer

Vitamins A, D, E, and K

Fat-Soluble Vitamins: Structure, Functions, and Health Implications

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