BIO CHEMISTRY MCQs (PART 2) by General knowledge Solutions
BIO CHEMISTRY MCQs (PART 2) by General knowledge Solutions
01. Prosthetic group in cone cell phototreceptors is
- (A) Iodine
- (B) Opsin
- (C) 11-cis-retinal
- (D) all-trans-retinal
02. Retinoic acid is
involved in the synthesis of
- (A) Rhodopsin
- (B) Iodopsin
- (C) Porphyrinopsin
- (D) Glycoproteins
03 Transducin is a
- (A) Signal transducer
- (B) Stimulatory G-protein
- (C) Trimer
- (D) All of these
04. Provitamin D3 is
- (A) Cholecalciferol
- (B) Ergosterol
- (C) 7-Dehydrocholesterol
- (D) Ergocaliferol
05. Ergosterol is found in
- (A) Animals
- (B) Plants
- (C) Bacteria
- (D) All of these
06. A provitamin D
synthesized in human beings is
- (A) Ergosterol
- (B) 7-Dehydrocholesterol
- (C) Cholecalciferol
- (D) 25-Hydroxycholecalciferol
07. 25-Hydroxylation of vitamin D occurs in
- (A) Skin
- (B) Liver
- (C) Kidneys
- (D) Intestinal mucosa
08. Tubular
reabsorption of calcium is increased by
- (A) Cholecalciferol
- (B) 25-Hydroxycholecalciferol
- (C) Calcitriol
- (D) All of these
09. Parathormone is
required for the conversion of
- (A) Cholecalciferol into 1-hydroxycholecalciferol
- (B) Cholecalciferol into 25-hydroxycholecalciferol
- (C) 25-Hydroxycholecalciferol into calcitriol
- (D) Cholesterol into 7-dehydrocholesterol
10. Calcitriol inhibits the conversion of
- (A) Cholesterol into 7-dehydrocholesterol
- (B) Cholecalciferol into 1-hydroxycholecalciferol
- (C) Cholecalciferol into 25-hydroxycholecalciferol
- (D) 25-Hydroxycholecalciferol into 1,25- dihydroxycholecalciferol
11. Bowlegs and knock-knees can occur in
- (A) Rickets
- (B) Osteomalacia
- (C) Both A and B
- (D) Hypervitaminosis D
12. Calcification of soft tissues can occur in
- (A) Osteomalacia
- (B) Rickets
- (C) Hypervitaminosis D
- (D) None of these
13. Levels of serum
calcium and inorganic phosphorus are increased in
- (A) Hypervitaminosis D
- (B) Hypoparathyroidism
- (C) Hypovitaminosis D
- (D) None of these
14. Requirement of
vitamin E increases with the increasing intake of
- (A) Calories
- (B) Proteins
- (C) PUFA
- (D) Cholesterol
15. In human beings,
vitamin E prevents
- (A) Sterility
- (B) Hepatic necrosis
- (C) Muscular dystrophy
- (D) None of these
16. Vitamin E protects
- (A) Polyunsaturated fatty acids against aperoxidation
- (B) Vitamin A and carotenes against oxidation
- (C) Lung tissue against atmospheric pollutants
- (D) All of these
17. Intestinal
bacteria can synthesise
- (A) Phyllogquinone
- (B) Farnoquinone
- (C) Both (A) and (B)
- (D) Menadione
18. A water soluble form of vitamin K is
- (A) Phylloquinone
- (B) Farnoquinone
- (C) Menadione
- (D) None of these
19. Prothrombin time is prolonged in
- (A) Vitamin K deficiency
- (B) Liver damage
- (C) Both (A) and (B)
- (D) None of these
20. A synthetic form of vitamin K is
- (A) Menadione
- (B) Farnoquinone
- (C) Phylloquinone
- (D) None of these
21. Retinal is reduced to retinol by retinene reductase in
presence of the coenzyme
- (A) NAD+
- (B) NADP+
- (C) NADH + H+
- (D) NADPH + H+
22. Retinal exists as an ester with higher fatty acids in
the
- (A) Liver
- (B) Kidney
- (C) Lung
- (D) All of these
23. Retinol is
transported to the blood as retinol attached to
- (A) α1-globulin
- (B) α2-globulin
- (C) β-globulin
- (D) γ-globulin
24. Carotenes are transported with the
- (A) Minerals
- (B) Proteins
- (C) Lipids
- (D) Lipoproteins
25. The drugs that form complexes with pyridoxal are
- (A) Isoniazid
- (B) Penicillamine
- (C) Rifampicin
- (D) Both (A) and (B)
26. In the blood the
vitamin esters are attached to
- (A) α1-lipoproteins
- (B) α2-lipoproteins
- (C) β-lipoproteins
- (D) γ-lipoproteins
27. The percentage of
Vitamin A in the form of esters is stored in the liver:
- (A) 80
- (B) 85
- (C) 90
- (D) 95
28. The performed Vitamin A is supplied by foods such as
- (A) Butter
- (B) Eggs
- (C) Fish liver oil
- (D) All of these
29. The non-protein
part of rhodopsin is
- (A) Retinal
- (B) Retinol
- (C) Carotene
- (D) Repsin
30. Lumirhodopsin is
stable only at a temperature below
- (A) –35°C
- (B) –40°C
- (C) –45°C
- (D) –50°C
31 The normal concentration of vitamin A in blood in I.V/dl:
- (A) 20–55
- (B) 24–60
- (C) 30–65
- (D) 35–70
32. Continued intake
of excessive amounts of vitamin A especially in children produces
- (A) Irritability
- (B) Anorexia
- (C) Headache
- (D) All of these
33. Vitamin D2 is
also said to be
- (A) Activated ergosterol
- (B) Fergocalciferol
- (C) Viosterol
- (D) All of these
34. The poor sources
of vitamin D:
- (A) Eggs
- (B) Butter
- (C) Milk
- (D) Liver
35. The activity of tocopherols is destroyed by
- (A) Oxidation
- (B) Reduction
- (C) Conjugation
- (D) All of these
36 Some tocopherols
are
- (A) Terpenoid in structure
- (B) Dional in structure
- (C) Isoprenoid in structure
- (D) Farnesyl in structure
37. The methyl groups in the aromatic nucleus of a
tocopherols are
- (A) 2
- (B) 3
- (C) 4
- (D) 5
38. Vitamin E stored in
- (A) Mitochondria
- (B) Microsomes
- (C) Both (A) and (B)
- (D) None of these
39. Vitamin E
protects the polyunsaturated fatty acids from oxidation by molecular oxygen in
the formation of
- (A) Superoxide
- (B) Peroxide
- (C) Trioxide
- (D) All of these
40. The tocopherols
prevent the oxidation of
- (A) Vitamin A
- (B) Vitamin D
- (C) Vitamin K
- (D) Vitamin C
41. Vitamin E
protects enzymes from destruction in
- (A) Muscles
- (B) Nerves
- (C) Gonads
- (D) All of these
42. Vitamin K
regulates the synthesis of blood clotting factors:
- (A) VII
- (B) IX
- (C) X
- (D) All of these
43. Ascorbic acid can
reduce
- (A) 2, 4-dinitro benzene
- (B) 2, 6-Dichlorophenol Indophenol
- (C) 2, 4-dibromobenzene
- (D) 2, 6-dibromo benzene
44. Sterilized milk
is devoid of
- (A) Vitamin A
- (B) Vitamin B1
- (C) Vitamin C
- (D) Vitamin D
45. The symptoms of scurvy are
- (A) Poor healing of wounds
- (B) Loosening of teeth
- (C) Anaemia
- (D) All of these
46. Kwashiorkor results from
- (A) Vitamin A deficiency
- (B) Vitamin D deficiency
- (C) Deficiency of minerals in diet
- (D) Protein and caloric deficiency in diet
47. Which among the following fatty acids is an essential
fatty acid for man?
- (A) Palmitic acid
- (B) Oleic acid
- (C) Linoleic acid
- (D) None of these
48. The number of nutritionally essential amino acids for
man is
- (A) 6
- (B) 8
- (C) 10
- (D) 12
49. Avidin is present in
- (A) Cow’s milk
- (B) Raw egg
- (C) Green leafy vegetables
- (D) Carrots
1. C 2. D 3. D 4. C 5. B 6. B 7. B 8. C 9. C 10. D 11. A 12.
C 13. A 14. C 15. D 16. D 17. B 18. C 19. C 20. A 21. C 22. D 23. A 24. D 25. D
26. C 27. D 28. D 29. A 30. D 31. B 32. D 33. D 34. C 35. A 36. A 37 B 38. C
39. B 40. A 41. D 42. D 43. B 44. C 45. B 46. D 47. C 48. B 49. B
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