Free Bio Chemistry MCQs
Free Bio Chemistry MCQs
1. A positive nitrogen balance occurs
(A) In growing infant
(B) Following surgery
(C) In advanced cancer
(D) In kwashiorkar
2. The main site of urea synthesis in mammals is
(A) Liver
(B) Skin
(C) Intestine
(D) Kidney
3. The enzymes of urea synthesis are found in
(A) Mitochondria only
(B) Cytosol only
(C) Both mitochondria and cytosol
(D) Nucleus
4. The number of ATP required for urea synthesis is
(A) 0
(B) 1
(C) 2
(D) 3
5. Most of the ammonia released from L-α- amino acids reflects the coupled action of transaminase and
(A) L-glutamate dehydrogenase
(B) L-amino acid oxidase
(C) Histidase
(D) Serine dehydratase
6. In urea synthesis, the amino acid functioning solely as an enzyme activator:
(A) N-acetyl glutamate
(B) Ornithine
(C) Citrulline
(D) Arginine
7. The enzyme carbamoyl phosphate synthetase requires
(A) Mg++
(B) Ca++
(C) Na+
(D) K+
8. Control of urea cycle involves the enzyme:
(A) Carbamoyl phosphate synthetase
(B) Ornithine transcarbamoylase
(C) Argininosuccinase
(D) Arginase
9. Transfer of the carbamoyl moiety of carbamoyl phosphate to ornithine is catalysed by a liver mitochondrial enzyme:
(A) Carbamoyl phosphate synthetase
(B) Ornithine transcarbamoylase
(C) N-acetyl glutamate synthetase
(D) N-acetyl glutamate hydrolase
10. A compound serving a link between citric acid cycle and urea cycle is
(A) Malate
(B) Citrate
(C) Succinate
(D) Fumarate
11. The 2 nitrogen atoms in urea are contributed by
(A) Ammonia and glutamate
(B) Glutamine and glutamate
(C) Ammonia and aspartate
(D) Ammonia and alanine
12. In carcinoid syndrome the argentaffin tissue of the abdominal cavity overproduce
(A) Serotonin
(B) Histamine
(C) Tryptamine
(D) Tyrosine
13. Tryptophan could be considered as precursor of
(A) Melanotonin
(B) Thyroid hormones
(C) Melanin
(D) Epinephrine
14. Conversion of tyrosine to dihydroxyphenylalanine is catalysed by tyrosine hydroxylase which requires
(A) NAD
(B) FAD
(C) ATP
(D) Tetrahydrobiopterin
15. The rate limiting step in the biosynthesis of catecholamines is
(A) Decarboxylation of dihydroxyphenylalanine
(B) Hydroxylation of phenylalanine
(C) Hydroxylation of tyrosine
(D) Oxidation of dopamine
(A) In growing infant
(B) Following surgery
(C) In advanced cancer
(D) In kwashiorkar
2. The main site of urea synthesis in mammals is
(A) Liver
(B) Skin
(C) Intestine
(D) Kidney
3. The enzymes of urea synthesis are found in
(A) Mitochondria only
(B) Cytosol only
(C) Both mitochondria and cytosol
(D) Nucleus
4. The number of ATP required for urea synthesis is
(A) 0
(B) 1
(C) 2
(D) 3
5. Most of the ammonia released from L-α- amino acids reflects the coupled action of transaminase and
(A) L-glutamate dehydrogenase
(B) L-amino acid oxidase
(C) Histidase
(D) Serine dehydratase
6. In urea synthesis, the amino acid functioning solely as an enzyme activator:
(A) N-acetyl glutamate
(B) Ornithine
(C) Citrulline
(D) Arginine
7. The enzyme carbamoyl phosphate synthetase requires
(A) Mg++
(B) Ca++
(C) Na+
(D) K+
8. Control of urea cycle involves the enzyme:
(A) Carbamoyl phosphate synthetase
(B) Ornithine transcarbamoylase
(C) Argininosuccinase
(D) Arginase
9. Transfer of the carbamoyl moiety of carbamoyl phosphate to ornithine is catalysed by a liver mitochondrial enzyme:
(A) Carbamoyl phosphate synthetase
(B) Ornithine transcarbamoylase
(C) N-acetyl glutamate synthetase
(D) N-acetyl glutamate hydrolase
10. A compound serving a link between citric acid cycle and urea cycle is
(A) Malate
(B) Citrate
(C) Succinate
(D) Fumarate
11. The 2 nitrogen atoms in urea are contributed by
(A) Ammonia and glutamate
(B) Glutamine and glutamate
(C) Ammonia and aspartate
(D) Ammonia and alanine
12. In carcinoid syndrome the argentaffin tissue of the abdominal cavity overproduce
(A) Serotonin
(B) Histamine
(C) Tryptamine
(D) Tyrosine
13. Tryptophan could be considered as precursor of
(A) Melanotonin
(B) Thyroid hormones
(C) Melanin
(D) Epinephrine
14. Conversion of tyrosine to dihydroxyphenylalanine is catalysed by tyrosine hydroxylase which requires
(A) NAD
(B) FAD
(C) ATP
(D) Tetrahydrobiopterin
15. The rate limiting step in the biosynthesis of catecholamines is
(A) Decarboxylation of dihydroxyphenylalanine
(B) Hydroxylation of phenylalanine
(C) Hydroxylation of tyrosine
(D) Oxidation of dopamine
16. The enzyme dopamine β-oxidase which catalyses
conversion of dopamine to norepinephrine requires
(A) Vitamin A
(B) Vitamin C
(C) Vitamin E
(D) Vitamin B12
17. In humans the sulphur of methionine and cysteine is excreted mainly as
(A) Ethereal sulphate
(B) Inorganic sulphate
(C) Sulphites
(D) Thioorganic compound
18. Small amount of urinary oxalates is contributed by the amino acid:
(A) Glycine
(B) Tyrosine
(C) Alanine
(D) Serine
19. The amino acid which detoxicated benzoic acid to form hippuric acid is
(A) Glycine
(B) Alanine
(C) Serine
(D) Glutamic acid
20. The amino acids involved in the synthesis of creatin are
(A) Arginine, glycine, active methionine
(B) Arginine, alanine, glycine
(C) Glycine, lysine, methionine
(D) Arginine, lysine, methionine
21. Chemical score of egg proteins is considered to be
(A) 100
(B) 60
(C) 50
(D) 40
22. Chemical score of milk proteins is
(A) 70
(B) 65
(C) 60
(D) 40
23. Chemical score of proteins of bengal gram is
(A) 70
(B) 60
(C) 44
(D) 42
24. Chemical score of protein gelatin is
(A) 0
(B) 44
(C) 57
(D) 60
25 Chemical score of protein zein is
(A) 0
(B) 57
(C) 60
(D) 70
26. Biological value of egg white protein is
(A) 94
(B) 83
(C) 85
(D) 77
27. Net protein utilisation of egg protein is
(A) 75%
(B) 80%
(C) 91%
(D) 72%
28. Net protein utilization of milk protein is
(A) 75%
(B) 80%
(C) 86%
(D) 91%
29. A limiting amino acid is an essential amino acid
(A) That is most deficient in proteins
(B) That is most excess in proteins
(C) That which increases the growth
(D) That which increases the weight gain
30. The limiting amino acid of rice is
(A) Lysine
(B) Tryptophan
(C) Phenylalanine
(D) Tyrosine
31. The limiting amino acid of fish proteins is
(A) Tryptophan
(B) Cysteine
(C) Lysine
(D) Threonine
32. Pulses are deficient in
(A) Lysine
(B) Threonine
(C) Methionine
(D) Tryptophan
33. A trace element deficient in the milk is
(A) Magnesium
(B) Copper
(C) Zinc
(D) Chloride
34. A conjugated protein present in the egg yolk is
(A) Vitellin
(B) Livetin
(C) Albuminoids
(D) Ovo-mucoid
35. The chief protein of cow’s milk is
(A) Albumin
(B) Vitellin
(C) Livetin
(D) Casein
(A) Vitamin A
(B) Vitamin C
(C) Vitamin E
(D) Vitamin B12
17. In humans the sulphur of methionine and cysteine is excreted mainly as
(A) Ethereal sulphate
(B) Inorganic sulphate
(C) Sulphites
(D) Thioorganic compound
18. Small amount of urinary oxalates is contributed by the amino acid:
(A) Glycine
(B) Tyrosine
(C) Alanine
(D) Serine
19. The amino acid which detoxicated benzoic acid to form hippuric acid is
(A) Glycine
(B) Alanine
(C) Serine
(D) Glutamic acid
20. The amino acids involved in the synthesis of creatin are
(A) Arginine, glycine, active methionine
(B) Arginine, alanine, glycine
(C) Glycine, lysine, methionine
(D) Arginine, lysine, methionine
21. Chemical score of egg proteins is considered to be
(A) 100
(B) 60
(C) 50
(D) 40
22. Chemical score of milk proteins is
(A) 70
(B) 65
(C) 60
(D) 40
23. Chemical score of proteins of bengal gram is
(A) 70
(B) 60
(C) 44
(D) 42
24. Chemical score of protein gelatin is
(A) 0
(B) 44
(C) 57
(D) 60
25 Chemical score of protein zein is
(A) 0
(B) 57
(C) 60
(D) 70
26. Biological value of egg white protein is
(A) 94
(B) 83
(C) 85
(D) 77
27. Net protein utilisation of egg protein is
(A) 75%
(B) 80%
(C) 91%
(D) 72%
28. Net protein utilization of milk protein is
(A) 75%
(B) 80%
(C) 86%
(D) 91%
29. A limiting amino acid is an essential amino acid
(A) That is most deficient in proteins
(B) That is most excess in proteins
(C) That which increases the growth
(D) That which increases the weight gain
30. The limiting amino acid of rice is
(A) Lysine
(B) Tryptophan
(C) Phenylalanine
(D) Tyrosine
31. The limiting amino acid of fish proteins is
(A) Tryptophan
(B) Cysteine
(C) Lysine
(D) Threonine
32. Pulses are deficient in
(A) Lysine
(B) Threonine
(C) Methionine
(D) Tryptophan
33. A trace element deficient in the milk is
(A) Magnesium
(B) Copper
(C) Zinc
(D) Chloride
34. A conjugated protein present in the egg yolk is
(A) Vitellin
(B) Livetin
(C) Albuminoids
(D) Ovo-mucoid
35. The chief protein of cow’s milk is
(A) Albumin
(B) Vitellin
(C) Livetin
(D) Casein
36. A water soluble vitamin deficient in egg is
(A) Thiamin
(B) Ribofalvin
(C) Ascrobic acid
(D) Cobalamin
37. Pulses are rich in
(A) Lysine
(B) Methionine
(C) Tryptophan
(D) Phenylalanine
38. Milk is deficient in
(A) Vitamin B1
(B) Vitamin B2
(C) Sodium
(D) Potassium
39. Milk is deficient in
(A) Calcium
(B) Iron
(C) Sodium
(D) Potassium
40. When net protein utilization (NPU) is low, the requirements for proteins are
(A) High
(B) Moderate
(C) Low
(D) Supplementary
41. Protein content of human milk is about
(A) 1.4%
(B) 2.4%
(C) 3.4%
(D) 4.4%
42. Protein content of cow’s milk is about
(A) 2.5%
(B) 3.5%
(C) 4.5%
(D) 5.5%
43. Protein content of soyabean is about
(A) 30%
(B) 40%
(C) 50%
(D) 60%
44. Lipid content of egg white is
(A) 12%
(B) 33%
(C) 10–11%
(D) Traces
45. The recommended daily allowance (RDA) of proteins for an adult man is
(A) 70 gms
(B) 50 gms
(C) 40 gms
(D) 30 gms
46. The basic amino acids are
(A) Lysine
(B) Bile acids
(C) Glycine
(D) Alanine
47. The daily caloric requirement for the normal adult female is about
(A) 1500
(B) 2100
(C) 2500
(D) 2900
48. In the total proteins, the percentage of albumin is about
(A) 20–40
(B) 30–45
(C) 50–70
(D) 80–90
49. In the total proteins percentage of α1 globulin is about
(A) 0.2–1.2%
(B) 1.2–2.0%
(C) 2.4–4.4%
(D) 5.0–10.0%
50. In the total proteins the percentage of γ globulin is about
(A) 2.4–4.4%
(B) 10.0–21.0%
(C) 6.1–10.1%
(D) 1.2–2.0%
51. Most frequently the normal albumin globulin ratioratio (A : G) is
(A) 1.0 : 0.8
(B) 1.5 : 1.0
(C) 2.0 : 1.0
(D) 2.4 : 1.0
52. In Thymol turbidity test the protein involved is mainly
(A) Albumin
(B) α1-Globulin
(C) α2-Globulin
(D) β Globulin
53. In quaternary structure, subunits are linked by
(A) Peptide bonds
(B) Disulphide bonds
(C) Covalent bonds
(D) Non-covalent bonds
54. Molecular weight of human albumin is about
(A) 156,000
(B) 90,000
(C) 69,000
(D) 54,000
55. At isoelectric pH, an amino acid exists as
(A) Anion
(B) Cation
(C) Zwitterion
(D) None of these
56. A disulphide bond can be formed between
(A) Two methionine residues
(B) Two cysteine residues
(C) A methionine and a cysteine residue
(D) All of these
57 A coagulated protein is
(A) Insoluble
(B) Biologically non-functional
(C) Unfolded
(D) All of the above
(A) Thiamin
(B) Ribofalvin
(C) Ascrobic acid
(D) Cobalamin
37. Pulses are rich in
(A) Lysine
(B) Methionine
(C) Tryptophan
(D) Phenylalanine
38. Milk is deficient in
(A) Vitamin B1
(B) Vitamin B2
(C) Sodium
(D) Potassium
39. Milk is deficient in
(A) Calcium
(B) Iron
(C) Sodium
(D) Potassium
40. When net protein utilization (NPU) is low, the requirements for proteins are
(A) High
(B) Moderate
(C) Low
(D) Supplementary
41. Protein content of human milk is about
(A) 1.4%
(B) 2.4%
(C) 3.4%
(D) 4.4%
42. Protein content of cow’s milk is about
(A) 2.5%
(B) 3.5%
(C) 4.5%
(D) 5.5%
43. Protein content of soyabean is about
(A) 30%
(B) 40%
(C) 50%
(D) 60%
44. Lipid content of egg white is
(A) 12%
(B) 33%
(C) 10–11%
(D) Traces
45. The recommended daily allowance (RDA) of proteins for an adult man is
(A) 70 gms
(B) 50 gms
(C) 40 gms
(D) 30 gms
46. The basic amino acids are
(A) Lysine
(B) Bile acids
(C) Glycine
(D) Alanine
47. The daily caloric requirement for the normal adult female is about
(A) 1500
(B) 2100
(C) 2500
(D) 2900
48. In the total proteins, the percentage of albumin is about
(A) 20–40
(B) 30–45
(C) 50–70
(D) 80–90
49. In the total proteins percentage of α1 globulin is about
(A) 0.2–1.2%
(B) 1.2–2.0%
(C) 2.4–4.4%
(D) 5.0–10.0%
50. In the total proteins the percentage of γ globulin is about
(A) 2.4–4.4%
(B) 10.0–21.0%
(C) 6.1–10.1%
(D) 1.2–2.0%
51. Most frequently the normal albumin globulin ratioratio (A : G) is
(A) 1.0 : 0.8
(B) 1.5 : 1.0
(C) 2.0 : 1.0
(D) 2.4 : 1.0
52. In Thymol turbidity test the protein involved is mainly
(A) Albumin
(B) α1-Globulin
(C) α2-Globulin
(D) β Globulin
53. In quaternary structure, subunits are linked by
(A) Peptide bonds
(B) Disulphide bonds
(C) Covalent bonds
(D) Non-covalent bonds
54. Molecular weight of human albumin is about
(A) 156,000
(B) 90,000
(C) 69,000
(D) 54,000
55. At isoelectric pH, an amino acid exists as
(A) Anion
(B) Cation
(C) Zwitterion
(D) None of these
56. A disulphide bond can be formed between
(A) Two methionine residues
(B) Two cysteine residues
(C) A methionine and a cysteine residue
(D) All of these
57 A coagulated protein is
(A) Insoluble
(B) Biologically non-functional
(C) Unfolded
(D) All of the above
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