The daily dietary requirement of Vitamin $B_{12}$ by an adult is

Questions 36

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Vitamin Drugs Questions

Question 1 of 5

The daily dietary requirement of Vitamin $B_{12}$ by an adult is

Correct Answer: A

Rationale: The adult daily requirement for vitamin B12 is 1-3 μg, sufficient for metabolic needs.

Question 2 of 5

Hydroxocobalamine differs from cyanocobalamine in that

Correct Answer: D

Rationale: Hydroxocobalamin is better retained and effective in tobacco amblyopia due to cyanide binding.

Question 3 of 5

Megaloblastic anemia is caused by deficiency of

Correct Answer: B

Rationale: Vitamin B12 deficiency causes megaloblastic anemia; iron causes microcytic, and vitamin C deficiency causes scurvy.

Question 4 of 5

Vitamin B12 is a required co-factor for the following reaction

Correct Answer: D

Rationale: Vitamin B12 is a cofactor in all three reactions, critical for energy metabolism and folate cycling.

Question 5 of 5

Vitamin K is indicated for the treatment of bleeding occurring in patients

Correct Answer: C

Rationale: Obstructive jaundice impairs vitamin K absorption, reducing clotting factor synthesis and causing bleeding.

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