Bio Chemistry MCQs
Bio Chemistry MCQs
1. The functions of plasma albumin are
2. Amino acid with side chain containing basic groups is
3. An example of α-amino acid not present in proteins but essential in mammalian metabolism is
4. An essential amino acid in man is
5. Non essential amino acids
6. Which one of the following is semiessential amino acid for humans?
7. An example of polar amino acid is
8. The amino acid with a nonpolar side chain is
9. A ketogenic amino acid is
10. An amino acid that does not form an α- helix is
11. An amino acid not found in proteins is
12. In mammalian tissues serine can be a biosynthetic precursor of
13. A vasodilating compound is produced by the decarboxylation of the amino acid:
14. Biuret reaction is specific for
15. Sakaguchi’s reaction is specific for
16. Million-Nasse’s reaction is specific for the amino acid:
17. Ninhydrin with evolution of CO2 forms a blue complex with
18. The most of the ultraviolet absorption of proteins above 240 nm is due to their content of
19. Which of the following is a dipeptide?
20. Which of the following is a tripeptide?
- (A) Osmosis
- (B) Transport
- (C) Immunity
- (D) both (A )and (B)
2. Amino acid with side chain containing basic groups is
- (A) 2-Amino 5-guanidovaleric acid
- (B) 2-Pyrrolidine carboxylic acid
- (C) 2-Amino 3-mercaptopropanoic acid
- (D) 2-Amino propanoic acid
3. An example of α-amino acid not present in proteins but essential in mammalian metabolism is
- (A) 3-Amino 3-hydroxypropanoic acid
- (B) 2-Amino 3-hydroxybutanoic acid
- (C) 2-Amino 4-mercaptobutanoic acid
- (D) 2-Amino 3-mercaptopropanoic acid
4. An essential amino acid in man is
- (A) Aspartate
- (B) Tyrosine
- (C) Methionine
- (D) Serine
5. Non essential amino acids
- (A) Are not components of tissue proteins
- (B) May be synthesized in the body from essential amino acids
- (C) Have no role in the metabolism
- (D) May be synthesized in the body in diseased states
6. Which one of the following is semiessential amino acid for humans?
- (A) Valine
- (B) Arginine
- (C) Lysine
- (D) Tyrosine
7. An example of polar amino acid is
- (A) Alanine
- (B) Leucine
- (C) Arginine
- (D) Valine
8. The amino acid with a nonpolar side chain is
- (A) Serine
- (B) Valine
- (C) Asparagine
- (D) Threonine
9. A ketogenic amino acid is
- (A) Valine
- (B) Cysteine
- (C) Leucine
- (D) Threonine
10. An amino acid that does not form an α- helix is
- (A) Valine
- (B) Proline
- (C) Tyrosine
- (D) Tryptophan
11. An amino acid not found in proteins is
- (A) β-Alanine
- (B) Proline
- (C) Lysine
- (D) Histidine
12. In mammalian tissues serine can be a biosynthetic precursor of
- (A) Methionine
- (B) Glycine
- (C) Tryptophan
- (D) Phenylalanine
13. A vasodilating compound is produced by the decarboxylation of the amino acid:
- (A) Arginine
- (B) Aspartic acid
- (C) Glutamine
- (D) Histidine
14. Biuret reaction is specific for
- (A) –CONH-linkages
- (B) –CSNH2 group
- (C) –(NH)NH2 group
- (D) All of these
15. Sakaguchi’s reaction is specific for
- (A) Tyrosine
- (B) Proline
- (C) Arginine
- (D) Cysteine
16. Million-Nasse’s reaction is specific for the amino acid:
- (A) Tryptophan
- (B) Tyrosine
- (C) Phenylalanine
- (D) Arginine
17. Ninhydrin with evolution of CO2 forms a blue complex with
- (A) Peptide bond
- (B) α-Amino acids
- (C) Serotonin
- (D) Histamine
18. The most of the ultraviolet absorption of proteins above 240 nm is due to their content of
- (A) Tryptophan
- (B) Aspartate
- (C) Glutamate
- (D) Alanine
19. Which of the following is a dipeptide?
- (A) Anserine
- (B) Glutathione
- (C) Glucagon
- (D) β -Lipoprotein
20. Which of the following is a tripeptide?
- (A) Anserine
- (B) Oxytocin
- (C) Glutathione
- (D) Kallidin
21. A peptide which acts as potent smooth muscle hypotensive
agent is
22. A tripeptide functioning as an important reducing agent in the tissues is
23. An example of metalloprotein is
24. Carbonic anhydrase is an example of
25. An example of chromoprotein is
26. An example of scleroprotein is
27. Casein, the milk protein is
28. An example of phosphoprotein present in egg yolk is
29. A simple protein found in the nucleoproteins of the sperm is
30. Histones are
31. The protein present in hair is
32. The amino acid from which synthesis of the protein of hair keratin takes place is
33. In one molecule of albumin the number of amino acids is
34. Plasma proteins which contain more than 4% hexosamine are
35. After re leas ing O2 at the tissues, hemoglobin transports
36. Ehlers-Danlos syndrome characterized by hypermobile joints and skin abnormalities is due to
37. Proteins are soluble in
38. A cereal protein soluble in 70% alcohol but insoluble in water or salt solution is
39. Many globular proteins are stable in solution inspite they lack in
40. The hydrogen bonds between peptide linkages of a protein molecules are interfered by
- (A) Glutathione
- (B) Bradykinin
- (C) Tryocidine
- (D) Gramicidin-s
22. A tripeptide functioning as an important reducing agent in the tissues is
- (A) Bradykinin
- (B) Kallidin
- (C) Tyrocidin
- (D) Glutathione
23. An example of metalloprotein is
- (A) Casein
- (B) Ceruloplasmin
- (C) Gelatin
- (D) Salmine
24. Carbonic anhydrase is an example of
- (A) Lipoprotein
- (B) Phosphoprotein
- (C) Metalloprotein
- (D) Chromoprotein
25. An example of chromoprotein is
- (A) Hemoglobin
- (B) Sturine
- (C) Nuclein
- (D) Gliadin
26. An example of scleroprotein is
- (A) Zein
- (B) Keratin
- (C) Glutenin
- (D) Ovoglobulin
27. Casein, the milk protein is
- (A) Nucleoprotein
- (B) Chromoprotein
- (C) Phosphoprotein
- (D) Glycoprotein
28. An example of phosphoprotein present in egg yolk is
- (A) Ovoalbumin
- (B) Ovoglobulin
- (C) Ovovitellin
- (D) Avidin
29. A simple protein found in the nucleoproteins of the sperm is
- (A) Prolamine
- (B) Protamine
- (C) Glutelin
- (D) Globulin
30. Histones are
- (A) Identical to protamine
- (B) Proteins rich in lysine and arginine
- (C) Proteins with high molecular weight
- (D) Insoluble in water and very dilute acids
31. The protein present in hair is
- (A) Keratin
- (B) Elastin
- (C) Myosin
- (D) Tropocollagen
32. The amino acid from which synthesis of the protein of hair keratin takes place is
- (A) Alanine
- (B) Methionine
- (C) Proline
- (D) Hydroxyproline
33. In one molecule of albumin the number of amino acids is
- (A) 510
- (B) 590
- (C) 610
- (D) 650
34. Plasma proteins which contain more than 4% hexosamine are
- (A) Microglobulins
- (B) Glycoproteins
- (C) Mucoproteins
- (D) Orosomucoids
35. After re leas ing O2 at the tissues, hemoglobin transports
- (A) CO2 and protons to the lungs
- (B) O2 to the lungs
- (C) CO2 and protons to the tissue
- (D) Nutrients
36. Ehlers-Danlos syndrome characterized by hypermobile joints and skin abnormalities is due to
- (A) Abnormality in gene for procollagen
- (B) Deficiency of lysyl oxidase
- (C) Deficiency of prolyl hydroxylase
- (D) Deficiency of lysyl hydroxylase
37. Proteins are soluble in
- (A) Anhydrous acetone
- (B) Aqueous alcohol
- (C) Anhydrous alcohol
- (D) Benzene
38. A cereal protein soluble in 70% alcohol but insoluble in water or salt solution is
- (A) Glutelin
- (B) Protamine
- (C) Albumin
- (D) Gliadin
39. Many globular proteins are stable in solution inspite they lack in
- (A) Disulphide bonds
- (B) Hydrogen bonds
- (C) Salt bonds
- (D) Non polar bonds
40. The hydrogen bonds between peptide linkages of a protein molecules are interfered by
- (A) Guanidine
- (B) Uric acid
- (C) Oxalic acid
- (D) Salicylic acid
41. Globular proteins have completely folded, coiled polypeptide chain and the axial ratio (ratio of length to breadth) is
- (A) Less than 10 and generally not greater than 3–4
- (B) Generally 10
- (C) Greater than 10 and generally 20
- (D) Greater than 10
42. Fibrous proteins have axial ratio
- (A) Less than 10
- (B) Less than 10 and generally not greater than 3–4
- (C) Generally 10
- (D) Greater than 10
43. Each turn of α-helix contains the amino acid residues (number):
- (A) 3.6
- (B) 3.0
- (C) 4.2
- (D) 4.5
44. Distance traveled per turn of α−helix in nm is
- (A) 0.53
- (B) 0.54
- (C) 0.44
- (D) 0.48
45. Along the α-helix each amino acid residue advances in nm by
- (A) 0.15
- (B) 0.10
- (C) 0.12
- (D) 0.20
46. The number of helices present in a collagen molecule is
- (A) 1
- (B) 2
- (C) 3
- (D) 4
47. In proteins the α-helix and β-pleated sheet are examples of
- (A) Primary structure
- (B) Secondary structure
- (C) Tertiary structure
- (D) Quaternary structure
48. The a-helix of proteins is
- (A) A pleated structure
- (B) Made periodic by disulphide bridges
- (C) A non-periodic structure
- (D) Stabilised by hydrogen bonds between NH and CO groups of the main chain
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