Proteins MCQs

By: Prof. Dr. Fazal Rehman | Last updated: May 22, 2025

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1. : What is the one-letter symbol for Aspartic Acid?



2. : Serine can be a precursor of all of the following, excluding?



3. : How many high energy bonds are utilized throughout the synthesis of Urea?



4. : Which amino acid is a precursor for a number of hormones?



5. : Oxidative conversion of amino acids to their corresponding keto acids occurs in:



6. : The two nitrogens in Urea are derived from:



7. : Which of the following is a basic amino acid?



8. : Glycine reacts with nitrous acid to form which of the following?



9. : Amino acids have which group?



10. : Which is proficient of forming zwitterion?



11. : Dry distillation of amino acids with barium hydroxide yields which of the following?



12. : α-Amino acids when heated alone, then form ________.



13. : Amino acids react with _____ reagent to produce a blue colour.



14. : Which is a sulphur-containing amino acid?



15. : Albumin is classified as:



16. : Which is not a common property of amino acids?



17. : Which reaction cannot be helpful and used for the synthesis of α-amino acids?



18. : Primary structure of protein refers to which of the following?



19. : Ninhydrin test is given by which of the following?



20. : Molecular weight of proteins may be determined by _____.



21. : Putrefaction is:



22. : Proteins have characteristics of which of the following?



23. : What are Enzymes?



24. : Trypsin, is an enzyme that can _________.



25. : Oxidative enzymes are accountable for which of the following?



26. : Enzymatic action is ideal at a fixed:



27. : Which structure refers to the arrangement of peptide chains of protein in space to form helix structure?



28. : Which test is not shown by proteins?



29. : _________ is the coagulation of protein on treatment with heavy metal salts or heating.



30. : Apoenzyme is:



31. : Coenzyme can be separated from enzyme by:



32. : A stereospecific enzyme is one which catalyzes:



33. : Urease, an enzyme helpful and used to estimate urea, is a:



34. : Protein tertiary structure is controlled by which factors?



35. : Digestion of protein is essentially



36. : The regular coiled arrangement produced by hydrogen bonding in proteins is known as



37. : The bonds that hold the tertiary structure of proteins together are:



38. : The positive Biuret test suggests the presence of two or more



39. : Oxytocin, a pituitary hormone, is a



40. : What is the isoelectric point of a protein or amino acid?



41. : Which is a neutral amino acid with aliphatic side chain?



42. : Which one of the following is a basic amino acid?



43. : Peptide bond formation involves removal of one molecule of:



44. : Which does the tertiary structure of a protein refer to?



45. : Many globular proteins are stable in solution although they lack in:



46. : Denatured collagen is known as:



47. : Polymer of less than 100 amino acids is termed as:



48. : Which amino acid contains a hydroxyl group?



49. : The minimum number of ionizable groups in an amino acid are



50. : Which amino acid is a precursor of catecholamines?



51. : All of the following amino acids are optically active except:



52. : What is the single-letter symbol for the amino acid “Glutamine”?



53. : A peptide bond:



54. : What is the single-letter symbol for the amino acid “Phenylalanine”?



55. : What is the single-letter symbol for the amino acid “Lysine”?



56. : Which is an example of a chromoprotein?



57. : What is the single-letter symbol for the amino acid “Arginine”?



58. : What is the single-letter symbol for the amino acid “Tryptophan”?



59. : What is the single-letter symbol for the amino acid “Glutamic Acid”?



60. : Which amino acid is not compatible with α-helix structure of proteins?



61. : Which is not an essential amino acid?



62. : Which one of the following statements concerning glutamine is true?



63. : Which interferes with the hydrogen bonds and hence the proteins?



64. : The pKa of the carboxyl groups of most of the amino acids is between:



65. : Which technique is helpful and used to determine the isoelectric point of a protein?



66. : ______ is a technique that can yield the most information about spatial characteristics of atoms in a protein?



67. : The main protein in hair, nails and epidermis is:



68. : Phenylalanine stabilizes the protein structure by which of the following?



69. : Which is mechanically durable and chemically unreactive protein occurring in all higher vertebrates?



70. : Which statement is true?



71. : Which one of the following amino acids could serve as the best buffer at pH 7.0?



72. : Which can be helpful and used for determination of N-terminal of polypeptide?



73. : The milk proteins are digested by which enzyme in the stomach of infants:



74. : What percentage of proteins from our diet is normally digested?



75. : Which is the coenzyme in transamination reactions?



76. : How can the excess of a particular L-amino acid affect the absorption of other amino acids?



77. : Which derives its nitrogen from amino acids?



78. : Why does the carbohydrate-rich diet induce sleep?



79. : Which is one of the symptoms of ammonia intoxication?



80. : Which is the symptom of inherited disorders of urea cycle?



81. : Which is a major vehicle for carrying ammonia from muscle to liver?



82. : Ammonia is detoxified in liver to form:



83. : Melanin is synthesized from:



84. : Which is oxidized by Monoamine oxidase?



85. : The normal daily excretion of urea by a man on normal carbohydrate, fat and protein diet through urine is between:



86. : Which two amino acids serve as precursors for polyamines?



87. : Which two amino acids serve as precursors for creatine in muscle tissues?



88. : Which is not a function of glutathione?



89. : Estimation of nitrogen in proteins is normally carried out by which of the following method?



90. : Hydrolysis of proteins provides which of the following?



91. : Combination of α-amino acids through which linkages results in formation of protein?



92. : In severe acidosis, the excretion of urea is:



93. : Which α-amino acid is not proficient of exhibiting optical isomerism?



94. : Which of the following is an acidic amino acid?



95. : Sanger’s reagent is:



 

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