Vitamins and Coenzymes problems
- 1. A deficiency of thiamin produces the disease known as
Options- A. beri-beri
- B. scurvy
- C. cataract
- D. anemia Discuss
Correct Answer: beri-beri
- 2. Which of the following are reduced coenzymes?
Options- A. NADH and FADH2
- B. NAD+ and FAD
- C. ATP and GTP
- D. Coenzyme A and ubiquinone Discuss
Correct Answer: NADH and FADH2
- 3. Vitamin K1 was first isolated from alfalalfa and has the phytyl side chain consisting of
Options- A. four isoprene units
- B. six isoprene units
- C. nine isoprene units
- D. four isoprene units Discuss
Correct Answer: four isoprene units
- 4. Biotin occurs mainly in combined forms bound to protein through
Options- A. ?-N-lysine moiety
- B. ?-S-lysine moiety
- C. ?-N-biotinyl-L-lysine
- D. ?-N-lipoyl - L-lysine Discuss
Correct Answer: ?-N-lysine moiety
- 5. An early sign of retinol deficiencies in man is
Options- A. night blindness
- B. keratinization
- C. xeropthalmia
- D. none of these Discuss
Correct Answer: night blindness
- 6. Dihydroorotate dehydrogenase contains
Options- A. 4 flavins and 4 atoms of iron per molecule
- B. 2 flavins and 4 atoms of iron per molecule
- C. 2 flavins and 2 atoms of iron per molecule
- D. 4 flavins and 2 atoms of iron per molecule Discuss
Correct Answer: 4 flavins and 4 atoms of iron per molecule
- 7. Which of these is a symptom of vitamin A deficiency?
Options- A. Osteoporosis
- B. Impaired taste perception
- C. Blindness
- D. Impaired blood clotting Discuss
Correct Answer: Blindness
- 8. Which of these is a vitamin A precursor?
Options- A. Cobalamin
- B. Pyridoxine
- C. Beta-Carotene
- D. Thiamine Discuss
Correct Answer: Beta-Carotene
- 9. Lipoic acid is a co-factor of the
Options- A. pyruvic dehydrogenase
- B. ?-ketoglutaric dehydrogenase
- C. both (a) and (b)
- D. di-hydroorotate dehydrogenase Discuss
Correct Answer: both (a) and (b)
- 10. An enzyme, L-folate reductase reduces folic acid to
Options- A. hydrofolic acid
- B. dihydrofolic acid
- C. trihydrofolic acid
- D. tetrahydrofolic acid Discuss
Correct Answer: dihydrofolic acid
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