MCQ TEST Chapter=2 (BIOLOGICAL MOLECULES)

Q:1: The branch of biology that deals with the study of in-organic and organic molecules that make up the body of a living organism is

(A) Pharmacology
(B) Biochemistry
(C) Both A and B
(D) Pharmaco-dynamics

Q:2: The six bio-elements that make up 98% of protoplasm are

(A) C, H, O, N, Mg+, K+
(B) C, H, O, N, Mg+, Na+
(C) C, H, O, N, Cl-, K+
(D) C, H, O, N, P, S

Q:3: What is shown in the diagram below

(A) Even Charge distribution
(B) Uneven charge distribution
(C) Polarity within Water molecule
(D) Both B and C

Q:4: Atoms form bonds by

(A) Gaining of electrons
(B) Losing of electrons
(C) Sharing of electrons
(D) All A, B and C


Q:5: If atoms of different elements combine, the molecule can also be called a

(A) Polymer
(B) Monomer
(C) Compound
(D) All choices are incorrect


Q:6: A _______________ occurs as bonds are formed or broken between atoms, ions or molecules.

(A) Chemical reaction
(B) Physical reaction
(C) Thermal reaction
(D) None of the above

Q:7: Electrolytes that release hydrogen ions in water are called

(A) Acids
(B) Bases
(C) Amphoteric
(D) All options are correct

Q:8: It is the most abundant compound in living organisms and makes up two-thirds of the weight of adults.

(A) Protein
(B) Water
(C) Carbohydrate
(D) Nucleic acid

Q:9: ATP releases energy when

(A) It undergoes a condensation reaction
(B) A hydroxyl group is added to it
(C) A phosphate group is added to it
(D) A phosphate group is removed from it

Q:10: A fatty acid is a compound made of a chain of carbon atoms plus

(A) An acid group at one end
(B) Acid group at both ends
(C) An amino group
(D) Amino group at both ends

Q:11: A bond that forms between a positively charged hydrogen atom of one molecule and a negative charged region of another molecule is a(n)

(A) Ionic bond
(B) Hydrogen bond
(C) Covalent bond
(D) Basic bond

Q:12: Dehydration and hydrolysis reactions involve removing or adding ___________to macromolecule subunits.

(A) CH and NH2
(B) C and H
(C) -COOH and H
(D) OH and H

Q:13: A chemical "buffer"

(A) can donate a H+ when the solution becomes too basic
(B) can absorb a H+ when the solution becomes too acidic
(C) is utilized in living systems to maintain correct pH (D) All of the above are correct

Q:14: Nucleotides have a nitrogenous base attached to a sugar at the

(A) 1’ carbon
(B) 3’ carbon
(C) 4’ carbon
(D) 5’ carbon


Q:15: If three molecules of a fatty acid, each having the formula C16H22COOH, were joined to a molecule of glycerol (C3H8O3), the resulting molecule would have the formula

(A) C48H68O6
(B) C48H74O6
(C) C54H71O6
(D) C54H68O9

Q:16: This aminoacid is called

(A) Glycine

(B) Alanine

(C) Leucine

(D) Valine

Q:17: Monosaccharides contain carbon atoms

(A) 3-7
(B) 3-6
(C) 3-9
(D) 3-10


Q:18: Stearin is

(A) Fatty acid
(B) Saturated acylglycerol
(C) Unsaturated acylglycerol
(D) None of these

Q:19: Energy absorbed to change water from liquid to gas is called

(A) Latent heat of fusion
(B) High surface tension
(C) Heat of vaporization
(D) High heat capacity

Q:20: The sources of carbohydrates are green plants. These are primary product of

(A) Respiration
(B) Catabolism
(C) Photosynthesis
(D) All A, B and C

Q:21: It is most abundant carbohydrate in the nature

(A) Glycogen
(B) Chitin
(C) Lignin
(D) Cellulose

Q:22: It is the most abundant organic component in living cells.

(A) Lipid
(B) Carbohydrate
(C) Water
(D) Protein

Q:23: Each of the 20 naturally occurring amino acids has a different

(A) NH2 group
(B) –COOH group
(C) R group
(D) –OH group


Q:24: The sum of all the chemical reaction that occurs in the body is known as

(A) Anabolism
(B) Metabolism
(C) Catabolism
(D) Differentiation

Q:25: Which is an organic molecule

(A) H2O
(B) H2SO4
(C) NO2
(D) C6H12O6

Q:26: Which class of molecule is the major component of cell membrane

(A) Phospholipid
(B) Cellulose
(C) Wax
(D) Triglyceride

Q:27: Peptide bonds are found in

(A) Protein
(B) Carbohydrate
(C) Lipids
(D) Inorganic compounds


Q:28: Glycerol is the back bone molecule for

(A) Disaccharides
(B) DNA
(C) Triglycerides
(D) ATP

Q:29: When a protein undergoes a hydrolysis reaction the end-products are

(A) Amino acids
(B) Monosaccharides
(C) Fatty acids
(D) Nucleotides

Q:30: Which of the following is considered to be neutral

(A) Urine
(B) Pure water
(C) Cytoplasm
(D) HCL

Q:31: The functional group –COOH is

(A) Acidic
(B) Basic
(C) Never ionized
(D) All options are correct

Q:32: Which of these is an example of hydrolysis

(A) Amino acid + amino acid – Dipeptide + H2O
(B) Dipeptide + H2O—amino acid + amino acid
(C) Both A and B
(D) Neither of these is correct

Q:33: A fatty acid is unsaturated if it

(A) Contains hydrogen
(B) Contains double bonds
(C) Contains an acidic group
(D) Bonds to glycogen

Q:34: A hormone is an example of which functional class of proteins.

(A) Contractile
(B) Structural
(C) Regulatory
(D) Cyclic


Q:35: The Sugar found in RNA is

(A) Fructose
(B) Galactose
(C) Deoxyribose
(D) Ribose

Q:36: Steroid are classified as

(A) Carbohydrates
(B) Lipids
(C) Proteins
(D) Nucleic acids

Q:37: Hemoglobin is an example of which functional class of protein

(A) Contractile
(B) Structural
(C) Regulatory
(D) Transportive

Q:38: In RNA the Nitrogen base that takes the place of thymine is

(A) Adenine
(B) Cytosine
(C) Uracil
(D) Guanine

Q:39: The Suffix that denotes a sugar is

(A) ase
(B) ose
(C) ide
(D) amide

Q:40: Two different molecule belonging to different categories, usually combine together to form

(A) Homomer molecule
(B) Macro molecule
(C) Conjugated molecule
(D) All options are correct

Q:41: It is an animal storage product that accumulates in the vertebrate liver and muscles.

(A) Cellulose
(B) Chitin
(C) Glycogen
(D) Fructose

Q:42: Asymmetrical lipid molecules with a hydrophilic head and a hydrophobic tail, with a phosphate group in place of one of the three fatty acid chains.

(A) Wax
(B) Terpenoid
(C) Steroid
(D) Phospholipid

Q:43: Triglycerides that are solid at room temperature.

(A) Fats
(B) Oils
(C) Linoleic acid
(D) None of these

Q:44: Triglycerides that are liquid at room temperature.

(A) Fats
(B) Oils
(C) Stearin
(D) All of these

Q:45: A chemical group composed of a central phosphorous bonded to four oxygens.

(A) Carbonyl group
(B) Sulfhydryl group
(C) Carboxylic
(D) Phosphate group

Q:46: Nucleic acids are polymers composed of monomer units known as

(A) Amino acids
(B) Nucleosides
(C) Nucleotides
(D) Nitrogenous bases

Q:47: There are __________ nitrogenous bases.

(A) Four
(B) Five
(C) Six
(D) Three

Q:48: The form of RNA that delivers information from DNA to be used in making a protein is ________________.

(A) messenger RNA
(B) ribosomal RNA
(C) transfer RNA


Q:49: RNA occurs in

(A) Nucleus
(B) Cytoplasm
(C) Both A and B
(D) Nucleoplam

Q:50: The monomer that makes up polysaccharides is

(A) Amino acids
(B) Glucose
(C) Fatty acids
(D) Glycerol

Q:51: Which of these is NOT a function of lipids?

(A) Long term energy storage
(B) Structures in cells
(C) Sex hormones
(D) Enzymes


Q:52: All living things use the same ___ amino acids.

(A) 4
(B) 20
(C) 100
(D) 64


Q:53: Which of these is NOT a nucleotide base found in DNA?

(A) Uracil
(B) Adenine
(C) Guanine;
(D) Thymine

Q:54: ATP consists of the ____________________, ribose sugar, , and phosphate group, PO4-2) plus two other phosphate groups.

(A) Cytosine base
(B) Guanine base
(C) Thymine base
(D) Adenine base

Q:55: Membrane carbohydrates when linked to lipids are called

(A) Sphingolipids
(B) Glycolipids
(C) Phospholipids
(D) Sterols

Q:56: Lactose is present in

(A) Sugar cane
(B) Fruits
(C) Milk
(D) Egg

Q:57: A disaccharide that gives two molecules of glucose on hydrolysis is

(A) Sucrose
(B) Lactose
(C) Maltose
(D) None of these

Q:58: In sugar cane and sugar beet, the storage product is

(A) Maltose
(B) Sucrose
(C) Lactose
(D) Isomaltose

Q:59: One molecule of glucose and one molecule of galactose form

(A) Maltose
(B) Sucrose
(C) Lactose
(D) Isomaltose

Q:60: Nucleic acids are related with

(A) Respiration
(B) Photosynthesis
(C) Heredity
(D) None of these

Q:61: Waxes from protective coating on

(A) Leaves
(B) Fruits
(C) Animal’s skin
(D) All of these

Q:62: The four nitrogenous bases which form the code words for DNA language are

(A) ACTU
(B) UTAC
(C) AGTU
(D) AGCT

Q:63: DNA and RNA differ in

(A) Sugar only
(B) Sugar and purines
(C) Sugar and pyrimindines
(D) Sugar & phosphate

Q:64: A bond formed between carboxylic acid and alcohol is

(A) Ester bond
(B) Amide bond
(C) Phosphate bond
(D) Ionic bond


Q:65: When amino acids in a polypeptide chain are arranged in spiral manner, it is called

(A) Primary structure
(B) Secondary structure
(C) Tertiary structure
(D) Quaternary structure

Q:66: The step of protein synthesis in which the information contained specific segment of DNA is copied into RNA is called

(A) Transduction
(B) Translation
(C) Transformation
(D) Transcription

Q:67: Choose the pair of terms that completes this sentence
Nucleotides are to __________as ____________ are proteins.

(A) Aminoacids______Polypeptides
(B) Genes _______ Enzymes
(C) Nucleic acids _____ Amino acids
(D) Polymers _____ Peptides

Q:68: Which of these terms includes all others in the list

(A) Nucleic acid
(B) Purine
(C) Nucleotide
(D) Nitrogenous base

Q:69 The compounds made up of simple repeating isoprenoid units are called

(A) Neutral lipids
(B) Terpenoids
(C) Waxes
(D) All of these

Q:70: The term Protein was coined by

(A) Berzelius
(B) G.J. Murlder
(C) Bloor
(D) T.H. Morgan

Q:71: Water molecule has characteristics of

(A) Acid
(B) Base
(C) Both acid and base
(D) None of these

Q:72: The amount of heat must be absorbed or lost by 1g of that substance to change its temperature by 1 C°

(A) Specific heat
(B) Heat of vaporization
(C) Both A and B
(D) None of these

Q:73: During the conversion of ATP into ADP __________ energy is released.

(A) 31.81 KJ / mole
(B) 7.3 K.Cal / mole
(C) 61.8 KJ / mole
(D) Both A and B.

Q:74: Molecular formula of Stearin fat is

(A) C57 H110 O6
(B) C57 H98 O6
(C) C57 H104 O8
(D) C57 H104 O6

Q:75: The carbohydrate molecule which yield 2 to 10 monosaccharide molecules on hydrolysis are

(A) Polysaccharides
(B) Oligosaccharides
(C) Monosaccharides
(D) Heterosaccharides

Q:76: It is estimated that a person of average size contains 16 Kg of fat which is equivalent to

(A) 244000 K.Cal of energy
(B) 164000 K.Cal of energy
(C) 144000 K.Cal of energy
(D) 188000 K.Cal of energy

Q:77: The four interconnected rings of steroid molecule have total

(A) 12 carbon
(B) 15 carbon
(C) 16 carbon
(D) 17 carbon

Q:78: ATP is an example of

(A) Mononucleotide
(B) Dinucleotide
(C) Polynucleotide
(D) None of these

Q:79: The process of making a polypeptide sequence from the genetic code of mRNA molecule associated with a ribosomes termed as

(A) Transduction
(B) Translation
(C) Transformation
(D) Transcription

Q:80: NAD is an example of

(A) Mononucleotide
(B) Dinucleotide
(C) Coenzyme
(D) Both B and C




Answer Key

1. B
2. D
3. D
4. D
5. C
6. A
7. A
8. B
9. D
10. A
11. B
12. D
13. D
14. A
15. C
16. B
17. A
18. B
19. C
20. C
21. D
22. D
23. C
24. B
25. D
26. A
27. A
28. C
29. A
30. B
31. A
32. B
33. B
34. C
35. D
36. B
37. D
38. C
39. C
40. C
41. C
42. D
43. A
44. B
45. D
46. C
47. B
48. A
49. C
50. B
51. D
52. B
53. A
54. D
55. B
56. C
57. C
58. B
59. C
60. C
61. D
62. D
63. C
64. A
65. B
66. D
67. C
68. A
69. B
70. A
71. C
72. A
73. D
74. A
75. B
76. C
77. D
78. A
79. B
80. D