FREE BIO CHEMISTRY MCQs WITH ANSWER
FREE BIO CHEMISTRY MCQs WITH ANSWER
1 Pepsin acts on denatured proteins to
produce
(A) Proteoses and peptones
(B) Polypeptides
(C) Peptides
(D) Dipeptides
2. Renin converts casein to paracasein in presence o
(B) Chymotrypsin
(C) Elastase
(D) Elastase
3. The enzyme trypsin is specific for peptide bonds of
(A) Basic amino acids
(B) Acidic amino acids
(C) Aromatic amino acids
(D) Next to small amino acid residues
4. Chymotrypsin is specific for peptide bonds containing
(A) Uncharged amino acid residues
(B) Acidic amino acids
(C) Basic amino acid
(D) Small amino acid residues
5.The end product of protein digestion in G.I.T. is
(A) Dipeptide
(B) Tripeptide
(C) Polypeptide
(D) Amino ac
6.Abnormalities of blood clotting are
(A) Haemophilia
(B) Christmas disease
(C) Gout
(D) Both (A) and (B)
7. An important reaction for the synthesis of amino acid from carbohydrate intermediates is transamination which requires the cofactor:
(A) Thiamin
(B) Riboflavin
(C) Niacin
(D) Pyridoxal phosphate
8. The main sites for oxidative
deamination are
(A) Liver and kidney
(B) Skin and pancreas
(C) Intestine and mammary gland
(D) Lung and spleen
9. A positive nitrogen balance occurs
(A) In growing infant
(B) Following surgery
(C) In advanced cancer
(D) In kwashiorkar
10. The main site of urea synthesis in mammals is
(A) Liver
(B) Skin
(C) Intestine
(D) Kidney
11. The enzymes of urea synthesis are found in
(A) Mitochondria only
(B) Cytosol only
(C) Both mitochondria and cytosol
(D) Nucleus
12. The number of ATP required for urea synthesis is
(A) 0
(B) 1
(C) 2
(D) 3
13. 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
14. In urea synthesis, the amino acid functioning solely as an enzyme activator:
(A) N-acetyl glutamate
(B) Ornithine
(C) Citrulline
(D) Arginine
15. The enzyme carbamoyl phosphate synthetase requires
(A) Mg++
(B) Ca++
(C) Na+
(D) K+
16. Control of urea cycle involves the enzyme:
(A) Carbamoyl phosphate synthetase
(B) Ornithine transcarbamoylase
(C) Argininosuccinase
(D) Arginase
17. 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
18. A compound serving a link between citric acid cycle and urea cycle is
(A) Malate
(B) Citrate
(C) Succinate
(D) Fumarate
19. 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
20. In carcinoid syndrome the argentaffin tissue of the abdominal cavity overproduce
(A) Serotonin
(B) Histamine
(C) Tryptamine
(D) Tyrosine
21. Tryptophan could be considered as precursor of
(A) Melanotonin
(B) Thyroid hormones
(C) Melanin
(D) Epinephrine
22. Conversion of tyrosine to dihydroxyphenylalanine is catalysed by tyrosine hydroxylase which requires
(A) NAD
(B) FAD
(C) ATP
(D) Tetrahydrobiopterin
21. 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) Liver and kidney
(B) Skin and pancreas
(C) Intestine and mammary gland
(D) Lung and spleen
9. A positive nitrogen balance occurs
(A) In growing infant
(B) Following surgery
(C) In advanced cancer
(D) In kwashiorkar
10. The main site of urea synthesis in mammals is
(A) Liver
(B) Skin
(C) Intestine
(D) Kidney
11. The enzymes of urea synthesis are found in
(A) Mitochondria only
(B) Cytosol only
(C) Both mitochondria and cytosol
(D) Nucleus
12. The number of ATP required for urea synthesis is
(A) 0
(B) 1
(C) 2
(D) 3
13. 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
14. In urea synthesis, the amino acid functioning solely as an enzyme activator:
(A) N-acetyl glutamate
(B) Ornithine
(C) Citrulline
(D) Arginine
15. The enzyme carbamoyl phosphate synthetase requires
(A) Mg++
(B) Ca++
(C) Na+
(D) K+
16. Control of urea cycle involves the enzyme:
(A) Carbamoyl phosphate synthetase
(B) Ornithine transcarbamoylase
(C) Argininosuccinase
(D) Arginase
17. 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
18. A compound serving a link between citric acid cycle and urea cycle is
(A) Malate
(B) Citrate
(C) Succinate
(D) Fumarate
19. 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
20. In carcinoid syndrome the argentaffin tissue of the abdominal cavity overproduce
(A) Serotonin
(B) Histamine
(C) Tryptamine
(D) Tyrosine
21. Tryptophan could be considered as precursor of
(A) Melanotonin
(B) Thyroid hormones
(C) Melanin
(D) Epinephrine
22. Conversion of tyrosine to dihydroxyphenylalanine is catalysed by tyrosine hydroxylase which requires
(A) NAD
(B) FAD
(C) ATP
(D) Tetrahydrobiopterin
21. 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
22. 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
23. In humans the sulphur of methionine and cysteine is excreted mainly as
(A) Ethereal sulphate
(B) Inorganic sulphate
(C) Sulphites
(D) Thioorganic compound
23. Small amount of urinary oxalates is contributed by the amino acid:
(A) Glycine
(B) Tyrosine
(C) Alanine
(D) Serine
24. The amino acid which detoxicated benzoic acid to form hippuric acid is
(A) Glycine
(B) Alanine
(C) Serine
(D) Glutamic acid
25. 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
26. Chemical score of egg proteins is considered to be
(A) 100
(B) 60
(C) 50
(D) 40
27. Chemical score of milk proteins is
(A) 70
(B) 65
(C) 60
(D) 40
28. Chemical score of proteins of bengal gram is
(A) 70
(B) 60
(C) 44
(D) 42
29. Chemical score of protein gelatin is
(A) 0
(B) 44
(C) 57
(D) 60
30 Chemical score of protein zein is
(A) 0
(B) 57
(C) 60
(D) 70
31. Biological value of egg white protein is
(A) 94
(B) 83
(C) 85
(D) 77
32. Net protein utilisation of egg protein is
(A) 75%
(B) 80%
(C) 91%
(D) 72%
33. Net protein utilization of milk protein is
(A) 75%
(B) 80%
(C) 86%
(D) 91%
34. 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
35. The limiting amino acid of rice is
(A) Lysine
(B) Tryptophan
(C) Phenylalanine
(D) Tyrosine
36. The limiting amino acid of fish proteins is
(A) Tryptophan
(B) Cysteine
(C) Lysine
(D) Threonine
37. Pulses are deficient in
(A) Lysine
(B) Threonine
(C) Methionine
(D) Tryptophan
38. A trace element deficient in the milk is
(A) Magnesium
(B) Copper
(C) Zinc
(D) Chloride
39. A conjugated protein present in the egg yolk is
(A) Vitellin
(B) Livetin
(C) Albuminoids
(D) Ovo-mucoid
40. 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
23. In humans the sulphur of methionine and cysteine is excreted mainly as
(A) Ethereal sulphate
(B) Inorganic sulphate
(C) Sulphites
(D) Thioorganic compound
23. Small amount of urinary oxalates is contributed by the amino acid:
(A) Glycine
(B) Tyrosine
(C) Alanine
(D) Serine
24. The amino acid which detoxicated benzoic acid to form hippuric acid is
(A) Glycine
(B) Alanine
(C) Serine
(D) Glutamic acid
25. 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
26. Chemical score of egg proteins is considered to be
(A) 100
(B) 60
(C) 50
(D) 40
27. Chemical score of milk proteins is
(A) 70
(B) 65
(C) 60
(D) 40
28. Chemical score of proteins of bengal gram is
(A) 70
(B) 60
(C) 44
(D) 42
29. Chemical score of protein gelatin is
(A) 0
(B) 44
(C) 57
(D) 60
30 Chemical score of protein zein is
(A) 0
(B) 57
(C) 60
(D) 70
31. Biological value of egg white protein is
(A) 94
(B) 83
(C) 85
(D) 77
32. Net protein utilisation of egg protein is
(A) 75%
(B) 80%
(C) 91%
(D) 72%
33. Net protein utilization of milk protein is
(A) 75%
(B) 80%
(C) 86%
(D) 91%
34. 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
35. The limiting amino acid of rice is
(A) Lysine
(B) Tryptophan
(C) Phenylalanine
(D) Tyrosine
36. The limiting amino acid of fish proteins is
(A) Tryptophan
(B) Cysteine
(C) Lysine
(D) Threonine
37. Pulses are deficient in
(A) Lysine
(B) Threonine
(C) Methionine
(D) Tryptophan
38. A trace element deficient in the milk is
(A) Magnesium
(B) Copper
(C) Zinc
(D) Chloride
39. A conjugated protein present in the egg yolk is
(A) Vitellin
(B) Livetin
(C) Albuminoids
(D) Ovo-mucoid
40. The chief protein of cow’s milk is
(A) Albumin
(B) Vitellin
(C) Livetin
(D) Casein
41. A water soluble vitamin deficient in
egg is
(A) Thiamin
(B) Ribofalvin
(C) Ascrobic acid
(D) Cobalamin
42. Pulses are rich in
(A) Lysine
(B) Methionine
(C) Tryptophan
(D) Phenylalanine
43. Milk is deficient in
(A) Vitamin B1
(B) Vitamin B2
(C) Sodium
(D) Potassium
44. Milk is deficient in
(A) Calcium
(B) Iron
(C) Sodium
(D) Potassium
(A) Thiamin
(B) Ribofalvin
(C) Ascrobic acid
(D) Cobalamin
42. Pulses are rich in
(A) Lysine
(B) Methionine
(C) Tryptophan
(D) Phenylalanine
43. Milk is deficient in
(A) Vitamin B1
(B) Vitamin B2
(C) Sodium
(D) Potassium
44. Milk is deficient in
(A) Calcium
(B) Iron
(C) Sodium
(D) Potassium
45. When net protein utilization (NPU) is low, the requirements for proteins are
(A) High
(B) Moderate
(C) Low
(D) Supplementary
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