Biology Chapter 3 Entry test MCQs
51. …………… are defensive proteins.
a. Antibodies
b. Antigens
c. Fibrinogen
d. Vaccines
52. Proteins of hair, horns, feathers and other skin parts are:
a. Enzymatic protein
b. Storage protein
c. Hormonal protein
d. Structural protein
53. Identify the protein, which cannot be crystallized.
a. Fibrin
b. Antibodies
c. Enzymes
d. Haemoglobin
Biological Molecules
54. How many peptide bonds are present in an insulin molecule?
a. 51
b. 49
c. 48
d. 50
55. Usually a polypeptide chain bends and folds upon itself to form a globular shape. This is protein’s:
a. Secondary conformation
b. Primary conformation
c. Quaternary conformation
d. Tertiary conformation
56. Which level of protein structure maintains the helix shape of enzymes?
a. Tertiary
b. Primary
c. Quaternary
d. Secondary
E. A and B
57. Which one of the following is used in synthesis of nucleic acid, hormones, co-enzyme and amino acid for protein synthesis?
a. Oxygen
b. Carbon
c. Nitrogen
d. Hydrogen
58. Enzymes are molecules of one of the following group of biomolecules. Mark the correct answer which can also be defined as a biological catalyst:
a. Carbohydrate
b. Protein
c. Vitamins
d. Fats
59. Which molecular structure of enzyme is essential for activity of enzyme?
a. Quaternary structure
b. Primary structure
c. Tertiary structure
d. Secondary structure
60. Secondary structure of protein is found in:
a. Keratin
b. Trypsin
c. Glucagon
d. Insulin
61. The number of amino acids that have been found to occur in cells and tissues are:
a. 20
b. 170
c. 45
d. 25
62. Most proteins are made up of type of amino acid:
a. 170
b. 20
c. 200
d. 25
63. Backbone of amino acid comprises of:
a. -COOH group
b. C-C-N
c. -H group
d. -NH2 Group
64. Bonds present in alpha helix are:
a. Disulphide linkage
b. Hydrogen bonds
c. Peptide bonds
d. Ionic bonds
65. Sequence of amino acids is important in:
a. Secondary structure
b. Primary structure
c. Quaternary structure
d. Tertiary structure
66. Which of the following holds the alpha helix of protein in its place?
a. Amino group
b. Hydrogen bond
c. Disulphide bond
d. R-group
67. The number and sequence of amino acids along a polypeptide chain is
Called structure of a protein.
a. Quaternary
b. Secondary
c. Tertiary
d. Primary
68. Most proteins are made up of:
a. 10 of amino acids
b. 16 types of amino acids
c. 20 types of amino acids
d. 170 types of amino acids
69. The structure of a fibrous protein comprises of polypeptide chains in the form of:
a. Flat uncoiled chains
b. Cluster
c. Long strands or fibrils
d. Spherical or curled up ball
70. In glycine, ‘R’ is………..
a. Ethane
b. Fatty acid
c. Methane
d. Hydrogen
71. The number and sequence of amino acids in a polypeptide chain is known as its…………
a. Secondary structure
b. Primary structure
c. Quaternary structure
d. Tertiary structure
72. Which type of bonds is required to maintain the alpha helix configuration of a protein?
a. Hydrogen bonds
b. Hydrophobic interactions
c. Ionic bonds
d. Disulfide bonds
73. The Structure given below is the constituent part of ?
a. Carbohydrates
b. Lipids
c. Vitamins
d. Proteins
74.Which of the following is a protease?
a. Oxidase
b. Deaminase
c. Catalase
d. Rennin
75. It is an amino acid and also a part of phospholipid:
a. Choline
b. Serine
c. Aspartic acid
d. Ethanolamine