Solving these MCQs can be quite a helpful attempt in the preparation for many different examinations, such as the Medical (MBBS) examination, Nursing, Paramedics, BS Biochemistry, EATA, MDCAT, NEET, and other competitive and entrance exams.
A. MCQs on "Structure of Amino Acids"
1. Proteins are...........
A. Polyhydroxyl colloidal substances
B. Oxygeneous Colloidal compounds
C. Nitrogenous colloidal substances
D. All of them
2. Proteins are amino acid residues joined together by.........
A. Glycosidic LinkageB. Peptide Linkage
C. Ester Linkage
D. None of these
3. Amino acids are known as amino acids because they contain...........and...........
A. Imino group, Acetic acid group
B. Amino group, Acetic acid group
C. Amino group, Carboxylic acid group
D. None of them
4. Amino Acids contain a side chain or.......group, which determines the characteristics and functions of an Amino Acid.
A. X
B. R
C. Alpha
D. All of them
B. MCQs on "Classification of Amino Acids"
5. More than 300 amino acids have been described, but only ........ Amino Acids have been found to be present in the mammalian tissues and take part in protein synthesis.
A. 10
B. 20
C. 30
D. None
6. Out of these 20 amino acids, .......are considered as essential Amino Acids
A. 10
B. 14
C. 16
D. None of them
7. Side chain of acidic amino acids is..........
A. Proton donor
B. Proton acceptor
C. Neither proton donor nor proton acceptor
D. None
8. Basic amino acids are.......
A. Di-carboxylic mono-amines
B. Di-amino tri-carboxylic acids
C. Di-amino mono-carboxylic acid
D. All of them
9. Side chains of Basic amino acids are.........
A. Proton donor
B. Electron pair donor
C. Neither proton donor nor proton acceptor
D. None
10. ............. amino acids are primarily metabolized in peripheral tissues (e.g. muscles) rather than in the liver.
A. Acidic
B. Basic
C. Branched-chain
D. All of them
11. All branched-chain amino acids have a similar route of.......
A. Anabolism
B. Catabolism
C. Amphibolism
D. None
12. Imino acids have ......... group, instead of an amino group (-NH2).
A. Imino (NH)
B. Carbamino
C. Ammonium
D. All of them
13. ........... amino acids upon catabolism yield products that can synthesize glycogen in the liver and muscles through a metabolic pathway called glyco-neo-genesis, (synthesize of glycogen from a non-carbohydrate source).
A. Gluconeogenic
B. Glucogenic or Glycogenic
C. Non-glycogenic
D. None
14. The catabolic products of Glucogenic Amino Acids are............ or one of the intermediate products of the citric acid cycle.
A. Citrate
B. Isocitrate
C. Ketoglutarate
D. None
15. Pyruvate and intermediate products of the citric acid cycle are the substrates for........
A. Glycogen
B. Glyco-neo-genesis
C. Glycolysis
D. All of them
16. Those amino acids upon that upon catabolism produce ketone bodies, such as ......... or one of its precursors e.g Acetyl Co-A or Aceto-acetyl Co-A.
A. Acetate
B. Acetoacetate
C. Fumarate
D. None
17. .......... and ........ are the only two essential amino acids, which are exclusively ketogenic in nature.
A. Valine, Lysine
B. Leucine, Lysine
C. Glutamic acid, Methionine
D. None
18. Acetoacetate is one of the three Ketone bodies. The other two are ........... and acetone.
A. Butyric acid
B. Alpha hydroxy alcohol
C. Beta Hydroxy Butyric acid
D. None
19. Those amino acids that contain polar .........side chain (R-group) are called Polar amino acids.
A. Hydrophilic
B. Hydrophobic
C. Both A and B
D. None
20. .......... amino acids have zero net charge at Physiological PH i.e. 7.4.
A. Non-polar
B. Ketogenic
C. Glucogenic
D. Polar
21. At .......... pH Cysteine and Tyrosine can lose a proton.
A. Acidic
B. Alkaline
C. Neutral
D. None
22. .......... participate in the formation of Hydrogen bonds.
A. Polar
B. Non-polar
C. Glucogenic
D. None
23. In an aqueous environment, such as GIT, the polar side chains (R-groups) are found on the ........... of protein, interacting with the aqueous environment.
A. Exterior
B. Interior
C. Mid
D. None
24. In ..........environment, such as membranes, the polar side chains (R-groups) are clustered (hide) in the interior of the protein.
A. Acidic
B. Lipid
C. Alkaline
D. None
25. The amino acids that contain ........ side chains (R-group) are known as Non-polar amino acids.
A. Lipophilic
B. Hydrophobic
C. Both A and B
D. None
26. The side chain (R-group) of ......... amino acids do not or give off protons and do not participate in hydrogen or ionic bond formation.
A. Acidic
B. Non-polar
C. Polar
D. None
27. Non-polar amino acids participate in ......... interactions by forming ......... bonds.
A. Hydrophilic, Covalent
B. Hydrophobic, Ionic
C. Hydrophobic, Non-covalent
D. None
28. .......... differs from other non-polar amino acids in that it contains an imino group rather than an amino group.
A. Analine
B. Proline
C. Serine
D. Valine
C. MCQs on "Zwitter Ion and Isoelctric pH"
29. When an amino acid is dissolved in an aqueous solution, one hydrogen atom moves automatically from the carboxyl group of amino acid towards the amino group of the same amino acid making the amino acid positively as well as negatively charged (dipolar) at the same time such ion is called........A. Cation
B. Isoelectric Ion
C. Zwitter Ion
D. None
30. Zwitter Ions are ...........
A. Electrically Neutral
B. Cationic
C. Anionic
D. None
31. ............ is an example of Zwitter Ion.
A. Leucine
B. Alanine
C. Iodine
D. None
32. Alanine can act either as a/an ......... and .........
A. Acid, Salt
B. Base, Acid
C. Alkali, Base
D. Both B and C
33. Substances that act as Proton donors, as well as Proton acceptors, are ........... in nature and are often called as ........
A. Neutral, Halolytes
B. Amphoteric, Neutrolytes
C. Amphoteric, Ampholytes
D. Both B and C
34. The pH at which an amino acid has no net charge on it and therefore does not move towards electrodes in an electric field is known as ............
A. Zwitterian pH
B. Amphotrric pH
C. Isoelectric pH
D. Both A and C
35. ............ pH is denoted by pI.
A. Acidic
B. Isoelectric
C. Neutral
D. None
36. At pH below pI, the amino acid ........ H+ Ions, and vice versa.
A. Donates
B. Accepts
C. Neither donates nor accepts
D. Both A and B
D. MCQs on "Functions of Amino Acids"
37. ........... amino acid is the initiator of Protein Synthesis.A. Alanine
B. Methionine
C. Asprangine
D. Both A and C
38. Methionine donates its methyl group to Nor-Adrenaline to synthesize.
A. Epinephrine
B. Adrenaline
C. GABA (Gamma Amino Butyric Acid).
D. Both A and B
39. ........... amino acid take part in the synthesis of Glutathione.
A. Methionine
B. Cystine
C. Cysteine
D. None
40. Glycine conjugates with ........... to synthesize bile salt (Na-glycocholate).
A. Cholic Acid
B. Bile Acid
C. Palmitic Acid
D. Both A and B
41. Due to the detoxification function of Glycine, in the liver, it detoxifies Benzoic acid by converting it into .................
A. Hippuric Acid
B. Arachidonic Acid
C. Cholic Acid
D. Both A and B
42. ........... take part in the synthesis of heme, Purines, and Creatine.
A. Cystine
B. Glycine
C. Methionine
D. None
43. ........... can be converted to other amino acids, e.g. Serine, which in turn is converted to Pyruvic acid and ultimately to Glucose and therefore glucogenic.
A. Aspartic Acid
B. Glycine
C. Phenylanaline
44. Glycine is a major ..........., which is used by the Renshaw cells of the spinal cord.
A. Neurotransmitter
B. Inhibitory Neurotransmitter
C. Excitatory Neurotransmitter
D. Both B and C
45. ......... cause muscle spasm by inhibiting the release of glycine.
A. Tetenay
B. Tetanus
C. Arthritis
D. None
46. Glycine takes part in the synthesis of ........
A. Glutathione
B. Glutamic Acid
C. Glutamine
D. Both B and C
47. .......... takes part in the synthesis of purines and pyrimidines for nucleic acids.
A. Aspartic Acid
B. Glutamic Acid
C. Taurine
D. None
48. Aspartic acid is a major ............. of the brain.
A. Neurotransmitter
B. Inhibitory Neurotransmitter
C. Excitatory Neurotransmitter
D. Both B and C
49. ..........., via its receptor, play a role in the long-term memory process.
A. DOPA
B. Glutamate
C. Glutamic Acid
D. Both B and C
50. ............ take part in the synthesis of Tyrosine, DOPA, Nor-Adrenaline, and Adrenaline.
A. Glutamic Acid
B. Aspartic Acid
C. Phenylanaline
D. None
51. .......... synthesizes thyroid hormone (Thyroxine)
C. Proline
D. Tyrosine
52. 60 mg of Tryptophan produces 1 mg of ...........
A. RiboflavinB. Niacin
C. Vitamin B3
D. Both B and C
53. ........... is a major constituent of connective tissues as Hydroxyproline, e.g. in Collagen.
A. ProlineB. Propanoline
C. Both A and B
D. None
54. .......... and ....... are used in the formation of urea from ammonia.
A. Citrulline, ProlineB. Proline, Ornithine
C. Citrulline, Ornithine
D. None
55. ......... conjugates with bile acid (Cholic Acid) to synthesize bile salt (Na-Taurocholate).
A. TaurineB. Methionine
C. Choline
D. Analine
56. .......... is used therapeutically in the treatment of Parkinson's disease.
A. TaurineB. GABA
C. DOPA
D. None
E. MCQs on "Inter-conversion of Amino Acids"
57. Phenylanaline is convertible to ........
A. TyrosineB. DOPA
C. Methionine
D. Both A and B
58. ........... is convertible to ..........
A. Methionine, DOPAB. Tyrosine, Cysteine
C. Glycine, DOPA
D. Tyrosine, DOPA
59. Methionine is convertible to ...........
A. DOPAB. Cysteine
C. Cystine
D. Both B and C
60. .......... is convertible to Cystine.
A. 2 CysteineB. 3 Cysteine
C. 4 Cysteine
D. None
61. Cystine is convertible to .........
A. SerineB. Glutamine
C. Alanine
D. Glycine
62. Glycine is convertible to ........
A. SerineB. Glutamine
C. Cystine
D. Both A and B
F. MCQs on "Peptide Bond (Acid-Amide Linkage)"
63. In a protein, the two amino acids are joined together by -COOH group on one side and -NH2 group on the other side through a covalent bond forming an ............. known as peptide Bond.
A. Basic-Amide LinkageB. Acid-Amide Linkage
C. Both A and B
D. None
64. Peptide bond is extremely stable and is only cleaved by ............. enzyme.
A. PancreaticB. Gastric
C. Proteolytic
D. None
65. Peptides mean ..........
A. Amino AcidsB. Proteins
C. Hormones
D. Both B and C
66. .......... are the peptide chains made up of 2 to 10 amino acids linked through peptide Bond e.g. dipeptide, tripeptide, tetrapeptide, etc.
A. PolypeptideB. Oligopeptide
C. Oligosaccharides
D. None
67. ......... is/are example(s) of the polypeptide.
A. AlbuminB. Globulin
C. Globin
D. All of them
F. MCQs on "Organization of Protein Structure"
68. The number and order of amino acids in the ................ polypeptide chain is called Primary Structure of the Proteins.
B. Branched
C. Coiled
D. All of them
69. The folding of the polypeptide chains into a specific structure held together by Disulphide and Hydrogen bonds is called.......... structure of the proteins.
A. PrimaryB. Tertiary
C. Quaternary
D. None
70. The arrangement of coiled chains of proteins is termed as ........ structure of proteins.
A. PrimaryB. Tertiary
C. Quaternary
D. None
Answer Key
|
MCQ
Number |
Correct
Option |
MCQ
Number |
Correct
Option |
MCQ
Number |
Correct
Option |
|
1 |
C |
2 |
B |
3 |
C |
|
4 |
B |
5 |
B |
6 |
A |
|
7 |
A |
8 |
C |
9 |
D |
|
10 |
C |
11 |
B |
12 |
A |
|
13 |
B |
14 |
D |
15 |
B |
|
16 |
B |
17 |
B |
18 |
C |
|
19 |
A |
20 |
21 |
B |
|
|
22 |
A |
23 |
A |
24 |
B |
|
25 |
C |
26 |
B |
27 |
C |
|
28 |
B |
29 |
C |
30 |
A |
|
31 |
B |
32 |
B |
33 |
C |
|
34 |
C |
35 |
B |
36 |
A |
|
37 |
B |
38 |
D |
39 |
B |
|
40 |
D |
41 |
A |
42 |
B |
|
43 |
B |
44 |
B |
45 |
B |
|
46 |
A |
47 |
A |
48 |
C |
|
49 |
D |
50 |
C |
51 |
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52 |
D |
53 |
A |
54 |
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55 |
A |
56 |
C |
57 |
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|
58 |
D |
59 |
B |
60 |
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61 |
C |
62 |
A |
63 |
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|
64 |
C |
65 |
A |
66 |
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|
67 |
D |
68 |
A |
69 |
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70 |
B |
71 |
72 |
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73 |
74 |
75 |
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76 |
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77 |
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78 |
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79 |
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80 |
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81 |
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82 |
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83 |
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84 |
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85 |
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86 |
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87 |
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88 |
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89 |
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90 |
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91 |
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92 |
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93 |
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94 |
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95 |
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96 |
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97 |
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98 |
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99 |
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100 |
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