16. An early sign of retinol deficiencies in man is
A. night blindness
B. keratinization
C. xeropthalmia
D. none of these
17. An enzyme, L-folate reductase reduces folic acid to
A. hydrofolic acid
B. dihydrofolic acid
C. trihydrofolic acid
D. tetrahydrofolic acid
18. What compound of raw egg white causes a syndrome similar to vitamin B deficiency?
A. Avidin
B. Betabindin
C. Ovalbumin
D. Albumin
19. The disease Beriberi is due to a dietary deficiency in
A. vitamin B1(thiamine)
B.vitamin B2(riboflavin)
C.vitamin B6(pyridoxine)
D.vitamin B12
20. Which of these is a symptom of vitamin A deficiency?
A. Osteoporosis
B. Impaired taste perception
C. Blindness
D. Impaired blood clotting
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