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Biochemistry MCQs Vitamins
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VITAMINS1. Vitamin A:
a) Deficiency can give rise to xerophthalmia
b) Is normally excreted in urine
c) Carnitine, Retinine and Retinone are known forms
d) Is required for collagen synthesis
e) Can be synthesized by intestinal flora
2. Vitamin D:
a) Requires parathyroid hormones for activation
b) Is water-soluble
c) Lowers calcium level in the blood
d) Deficiency from overexposure to the sun
e) Is not required in the diet
3. Vitamin K:
a) Is derived from cholesterol
b) Is synthesized by intestinal flora
c) Deficiency causes night blindness
d) Cannot be stored in the body
e) Is involved in transamination reactions
4. Beriberi:
a) Is due to deficiency of pyruvate dehydrogenase complex
b) Affects the nervous system and the heart
c) Is due to deficiency in Vitamin C
d) Is associated with bone deformity
e) Can be treated by iron supplements
5. Vitamin B12:
a) Is a potent anti-oxidant
b) Deficiency causes pellagra
c) Vegetable seeds are a major source
d) Is not stored in the body
e) Requires the intrinsic factor for absorption
6. Pyridoxal Phosphate:
a) Is vitamin B5
b) Deficiency causes rickets
c) Is coenzyme with pyruvate carboxylase
d) Can be synthesized in the human body
e) Is needed by the enzyme alanine transaminase
7. The following is formed in the liver:
a) Cholicalciferol
b) 7- dehydrocholesterol
c) 1, 25- dihydroxycholecalciferol
d) 25- hydroxycholecalciferol
e) 24, 25- dihydroxycalciferol
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