MCQ Questions Paper on Vitamins
1.Most vitamins
a. precursors to coenzymes.
b. are synthesized by humans.
c. consist of amino acids, fatty acids or sugars.
d. are covalently linked to proteins without modification
Ans:A
2.A cofactor (vitamin) that is a carrier of activated CO2 and participates in both gluconeogenesis and fatty acid synthesis is
a. lipoamide.
b. pyridoxal phosphate.
c. biotin.
d. flavin adenine dinucleotide.
e. pantothenic acid.
Ans:C
3.You see many patients who subsist on a diet of corn meal and boiled greens, have little appetite for food, alternate between diarrhea and constipation, have an inflamed tongue, and a scaly dermatitis on exposed skin. The patients most likely have a vitamin deficiency resulting in decreased
a. alpha-keto acid decarboxylation.
b. two-electron transfer reactions.
c. acyl group transfer reactions.
d. transaminations.
e. proline and lysine hydroxylation.
Ans:B
4.A ten year old child complains about hurting all over, has pinpoint hemorrhages at hair follicles, several irregular purple spots on his legs, and receding gums. This child most likely has a vitamin deficiency resulting in decreased
a. alpha-keto acid decarboxylation.
b. two-electron transfer reactions.
c. acyl group transfer reactions.
d. transaminations.
e. proline and lysine hydroxylation.
Ans:E
5.Adequate levels of vitamin D and low levels of calcium in the blood induce the following conversion of vitamin D in the kidney:
a. 7-dehydrocholesterol –> vitamin D3
b. 25-hydroxy-vitamin-D3 –> 1,25 dihydroxy-vitamin-D3
c. vitamin D3 –> 25-hydroxy-vitamin-D3
d. vitamin D2 –> vitamin D3
e. 25-hydroxy-vitamin-D3 –> 24,25-dihydroxy-vitamin-D3
Ans:B
6.The vitamin most directly involved in protecting biomolecules from damage caused by oxidation is
a. A.
b. B3.
c. C.
d. D.
e. E.
Ans:E
7.Your patient has a poorly healing wound, numerous recurring infections, dry scaly skin, and a complaint that food is tasteless. This patient most likely has a deficiency of
a. iron.
b. calcium.
c. zinc.
d. phosphorus.
e. copper.
Ans:C
8.Selenium is required by the detoxifying enzyme
a. superoxide dismutase.
b. xanthine oxidase.
c. cytochrome P450.
d. glutathione peroxidase.
e. catalase.
Ans:D
9.Laboratory tests for a 45 year old male alcoholic patient show an accumulation of lactate and pyruvate in bodily fluids, suggesting a block in the conversion of pyruvate to acetyl-CoA. He appears confused and shows a slight weakness of eye movement. This patient should most probably be treated with injections of
a. thiamin.
b. riboflavin.
c. niacin.
d. pantothenic acid.
e. biotin.
Ans:A
10.A patient has been receiving all of her nutrition through a catheter in the superior vena cava. She complains of pain in her arms and legs, a tingling in her hands and feet. She has been loosing hair. Tests show high cholesterol and electrocardiogram abnormalities. This patient should most probably be treated by supplementing her nutrition solution with
a. thiamin.
b. riboflavin and niacin.
c. folacin and cobalamine.
d. pantothenic acid.
e. biotin.
Ans:E
11.Tests for an elderly vegetarian patient indicate pernicious and megaloblastic anemia resulting from abnormally large “macrocytic” red blood cells that undergo rapid hemolysis. These results are most probably related to a vitamin deficiency in
a. ascorbic acid.
b. riboflavin and niacin.
c. folacin and cobalamine.
d. pantothenic acid.
e. biotin and pyridoxine.
Ans:C
12.The vitamin most likely needed for step I, the conversion of 5-hydroxy-tryptophan to serotonin, is
a. pyridoxine.
b. riboflavin.
c. biotin.
d. niacin.
e. folic acid.
Ans:A