ATI RN
Vitamin Drugs Questions
Question 1 of 5
in adults, approximately $\mathrm{mg}$ of thiamine per day is completely degraded by the tissue
Correct Answer: C
Rationale: Approximately 1 mg of thiamine is degraded daily in adults, matching the recommended dietary allowance.
Question 2 of 5
Which of the following drugs is correctly associated with its clinical application?
Correct Answer: D
Rationale: Ferrous sulfate treats microcytic anemia (iron deficiency) common in pregnancy; erythropoietin is for renal anemia, not macrocytic; folic acid treats megaloblastic anemia, not hemochromatosis.
Question 3 of 5
Conversion of methionine to cysteine depends on vitamin
Correct Answer: C
Rationale: Vitamin B6 (pyridoxine) is a cofactor in the transsulfuration pathway converting methionine to cysteine.
Question 4 of 5
Avidin, a protein found in egg white is an antagonist of
Correct Answer: A
Rationale: Avidin binds biotin tightly, preventing its absorption and acting as an antagonist.
Question 5 of 5
All of the following are important functions of magnesium $(\mathrm{Mg})$ except
Correct Answer: B
Rationale: Magnesium is critical for nerve conduction, muscle contractility, and metabolism, but not directly for phospholipid synthesis.