Which of the following substances contributes to the destruction of vitamin B6 in the body?
a. Pyridoxine
b. Vitamin A
c. Tryptophan
d. Alcohol
e. Nicotine
Answer: D
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Niacin is a component of coenzymes involved in the
A. synthesis of essential amino acids. B. synthesis of ethanol, fatty acids, and cholesterol. C. catabolism of carbohydrates, fats, proteins, and alcohol. D. synthesis and maintenance of the myelin sheath.
Which of the following is found in the first stage of iron deficiency?
a. Hemoglobin synthesis declines, as assessed by erythrocyte protoporphyrin. b. Hemoglobin levels fall, as assessed by complete blood count. c. Iron stores decline, as assessed by serum ferritin. d. Red blood cell count falls, as assessed by hematocrit count. e. Erythrocyte protoporphyrin, begins to accumulate.
For which of the following micronutrients does absorption increase with age?
A) iron B) vitamin A C) vitamin B12 D) calcium
When physicians prescribe the use of corticosteroids, they raise the risk of
a. osteomalacia. b. osteoporosis. c. iron deficiency. d. folate deficiency.