26 Biomolecules Quiz | Chemistry Quiz #mcq.cetjob - Multiple choice questions and Objectives
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Biomolecules Quiz | Chemistry Quiz

All living bodies are composed of several lifeless substances which are present in their cells in a very complex but highly organised form. These are called biomolecules. Some common examples are carbohydrates, proteins, enzymes, nucleic acids, lipids, amino acids, fats etc :
Living organisms  Organs  Tissues  Cells  Organelles  Biomolecules.
  The carbohydrates are naturally occurring organic substances. They are present in both plants and animals. 
"Carbohydrates are defined as a class of compounds that include polyhydric aldehydes or polyhydric ketones and large polymeric compounds that can be broken down (hydrolysed) into polyhydric aldehydes or ketones.”

Carbohydrates Quiz

1. The 'phosphoglycerides' occur in
(a) The brain and the spinal chord
(b) Nails and hairs
(c) Oils and fats
(d) Waxes

2. Sucrose is a 
(a) Monosaccharide
(b) Disaccharide
(c) Trisaccharide
(d) Polysaccharide

3. On complete hydrolysis of starch, we finally get

(a) Glucose (b) Fructose
(c) Glucose and fructose (d) Sucrose

4. The letter ‘D’ in carbohydrates represents
(a) Its direct synthesis
(b) Its dextrorotation
(c) Its mutarotation
(d) Its configuration

5. Starch can be used as an indicator for the detection of traces of
(a) Glucose in aqueous solution
(b) Protein in blood
(c) Iodine in aqueous solution
(d) Urea in blood

6. It is best to carry out reactions with sugars in neutral or acid medium and not in alkaline medium. This is because in alkaline medium sugars undergo one of the following changes
(a) Racemisation
(b) Decomposition
(c) Inversion
(d) Rearrangement

7. Which one of the following compounds is found abundantly in nature
(a) Fructose (b) Starch
(c) Glucose (d) Cellulose

8. The substance that forms the plant cell walls is or Which carbohydrates is an essential constituents of plant cells
(a) Cellulose (b) Sucrose
(c) Vitamins (d) Starch

9. The fructose molecule in sucrose exists as
(a) Furanose (b) Pyranose
(c) Open chain (d) All

10. Which one of the following is laevorotatory 
(a) Glucose
(b) Sucrose
(c) Fructose
(d) None of these

11. Chemically 'digestion' is 
(a) Hydrolysis
(b) Change in bacteria
(c) Hydrogenation
(d) Dehydrogenation

12. Which one of the following is the reagent used to identify glucose 
(a) Neutral ferric chloride 
(b) Chloroform and alcoholic KOH
(c) Ammoniacal silver nitrate
(d) Sodium ethoxide

13. The aqueous solution of a carbohydrate gives dark blue colour with iodine. It is
(a) Glucose (b) Fructose
(c) Sucrose (d) Starch
SOL: (d) Starch + I2  Blue colour.

14. Which of the following carbohydrates is a disaccharide
(a) Glucose (b) Fructose
(c) Raffinose (d) Maltose

15. Optical activity is shown by
(a) Glucose (b) Fructose
(c) Sucrose (d) All of these
SOL: (d) Glucose and sucrose are dextrorotatory Fructose is leavorotatory

16. Which is a reducing sugar
(a) Glucose (b) Fructose
(c) Galactose (d) All of these

17. Hydrolytic conversion of sucrose into glucose and fructose is known as
(a) Induction
(b) Saponification
(c) Inversion
(d) Esterification

18. Starch is a polymer of 

(a) Glucose
(b) Fructose
(c) Both (a) and (b)
(d) None of these

19. To become a carbohydrate a compound must contain at least
(a) 2 carbons (b) 3 carbons
(c) 4 carbons (d) 6 carbons
SOL: (b) 3 carbons e.g. Glyceraldehyde  

20. Lactose on hydrolysis gives 
(a) Two glucose molecules
(b) Two galactose molecules
(c) A galactose molecule and a fructose molecule
(d) A galactose molecule and a glucose molecule
21. Which carbohydrates has highest abundance in human blood
(a) d-fructose (b) d-glucose
(c) Sucrose (d) Lactose

22. Formation of silver mirror by glucose shows that it is a/an
(a) Oxidising agent (b) Acid
(c) Reducing agent (d) A salt of silver

23. A sugar, that is not a disaccharide, among the following is
 (a) Lactose (b) Galactose 
(c) Sucrose (d) Maltose

24. To detect the reducing and non reducing sugars, which of the following test is used 
(a) Molisch test (b) Biuret test
(c) Fehling's test (d) Millions test

25. Which of the following is a disaccharide 
(a) Glucose (b) Ribulose
(c) Lactose (d) Arabinose

26. On heating glucose with Fehling's solution we get a precipitate whose colour is

(a) Yellow (b) Red
(c) Black (d) White
SOL: (b)Glucose + Fehling solution  Gluconic acid + Cu2O

Proteins, Amino Acids and Enzymes Quiz

27. The proteins which are insoluble in water are
 (a) Fibrous proteins (b) Globular proteins
(c) Both (a) and (b) (d) None of these
SOL: (a) Fibrous proteins are insoluble in water.

28. Irreversible precipitation of proteins is called
(a) Denaturation (b) Hydrolysis
(c) Rearrangement (d) Electrophoresis
SOL: (a)  

29. The proteins with a prosthetic group are called
(a) Pseudo proteins
(b) Complex proteins
(c) Conjugated proteins 
(d) Polypeptides
SOL: (c)

30. Proteins are hydrolysed by enzymes into
(a) Dicarboxylic acids
(b) Hydroxy acids
(c) Amino acids
(d) Aromatic acids
SOL: (c)
31. Proteins when heated with conc. HNO3 give a yellow colour. This is
(a) Oxidising test
(b) Xanthoprotic test
(c) Hoppe's test
(d) Acid-base test
SOL:  (b)Protein + conc.HNO3  Yellow colour [This test is given by a protein which consists of -amino acids containing a benzene ring such as tyrosine, phenylalanine etc. The yellow colour is due to nitration of benzene ring.]

32. Enzymes are
(a) Proteins (b) Minerals
(c) Oils (d) Fatty acids
SOL:   A

33. Which is an essential constituent of diet
(a) Starch (b) Glucose
(c) Carbohydrate (d) Protein
SOL:   D

34. Proteins can be used 
(a) As food (b) In textile
(c) As enzyme (d) All of these
SOL:   D
35. Which of the following foodstuffs contains nitrogen
(a) Carbohydrates
  (b) Fats 
(c) Proteins 
(d) None of these
SOL:   (c) Proteins are nitrogenous compounds.

36. The molecular weight of protein is
(a) < 10000
(b) > 10000
(c) > 1000
(d) > 1000 and < 10000
SOL:   B

37. Which of the following is not a classification of proteins
(a) Enzymes (b) Antibodies
(c) Antigens (d) Hormones
SOL:   (c) Antigens are polysaccharides present on RBC's surface.

38. The protein that is a structural material is
(a) Albumin (b) Oxytocin
(c) Haemoglobin (d) Keratin
SOL:   D

39. Enzymes
(a) Accelerate biochemical reactions
(b) Have optimum activity at body temperature
(c) Consist of amino acids
(d) Have all these properties
SOL:   D

40. Amino acids are produced on hydrolysis of
(a) Nucleic acid
(b) Carbohydrates
(c) Fats
(d) Proteins
SOL:   D

41. Enzymes belong to which class of compounds
(a) Polysaccharides
(b) Polypeptides
(c) Polynitrogen-heterocyclic compounds
(d) Hydrocarbons
SOL:   B

42. Which one of the following is an example of a globular protein
(a) Keratin (b) Insulin
(c) Collagen (d) Myoglobin
SOL:   D

43. Leucine amino acids is the
(a) Essential   (b) Non-essential  
(c) Aromatic   (d) Basic
SOL:   A

44. Which of the following tests is not used for testing proteins
 (a) Millon's test
(b) Molisch's test 
(c) Biuret test
(d) Ninhydrin test
SOL:   B

45. The optically inactive amino acid is
 (a) Lysine (b) Glycine
(c) Arginine (d) Alanine
SOL:   B

46. Which Alpha amino acid can cross link peptide chains 
 (a) Serine (b) Cysteine 
(c) Glutamine (d) Tyrosine
SOL:   B

47. Amino acids are the building blocks of
(a) Fat (b) Vitamin
(c) Protein (d) Carbohydrate
SOL:   C

48. Which of the following protein destroys the antigen when it enters in body cell
(a) Antibodies
(b) Insulin
(c) Chromoprotein 
(d) Phosphoprotein
SOL:   A

49. An antibiotic with a broad spectrum
(a) Kills the antibodies
(b) Acts on a specific antigen
(c) Acts on different antigents
(d) Acts on both the antigens and antibodies
SOL:   C

50. Which enzyme convert glucose into alcohol
 (a) Invertase (b) Zymase
(c) Maltase (d) Diastase
SOL:   (b)Zymase enzyme convert glucose into alcohol. It is found in the yeast.

Fats and Lipids Quiz

51. Which of the following is not a lipid
(a) Oils (b) Fats
(c) Waxes (d) Proteins
SOL:   D

52. The ‘saponification value’ of an oil or fat is measured in terms of
(a) (b) NaOH
(c) KOH (d) C6H5OH
SOL:   (c) Saponification value is the number of mg of KOH required to neutralize the fatty acid resulting from the complete hydrolysis of 1gm. of oil or fat.
53. The ‘iodine value’ of an oil indicates
(a) Its boiling point
(b) Inflammability
(c) Unsaturation present in acid contents
(d) Solubility of salt in oils
SOL:   (c) Iodine number is the number of gms of I2 which combine with 100 gm of oil or fat. It shows the degree of unsaturation of acids in fat or oil.

54. Which of the following compounds do not belong to lipids
(a) Fats
(b) Amino acids
(c) Phospholipids
(d) Carbohydrates

SOL:   B&D

55. Which is not a macromolecule
(a) DNA (b) Starch
(c) Palmitate (d) Insulin
SOL:   C

56. A distinctive and characteristic functional group of fats is
 (a) An ester group
(b) A peptide group
(c) A ketonic group
(d) An alcoholic group
SOL:   A

57. The waxes are long chain compounds of fatty acids, which belong to the class of 
(a) Esters (b) Ethers
(c) Alcohols (d) Acetic acid
SOL:   (a) Waxes are esters of higher fatty acids.

58. Which of the following is not glyceride
(a) Lipids (simple) (b) Phospholipids
(c) Sphingolipids (d) All
SOL:   C

59. The most important food reserves of animals and plants are

(a) Carbohydrates (b) Proteins
(c) Vitamins (d) Fats
SOL:   (d) Fats are called energy bank of the body. Stored below the dermis as subcutaneous fats.

60. Which of the following gives maximum energy in metabolic processes
(a) Proteins
(b) Carbohydrates
(c) Lipids
(d) Vitamins
SOL:   C

61. The waxes are long chain compounds of fatty acids, which belong to the class of  
(a) Esters (b) Ethers
(c) Alcohols (d) Acetic acid
SOL:   (a)Waxes are esters of higher fatty acids.

62. Hydrolytic reaction of fats, with caustic soda, is known as
 (a) Acetylation
(b) Carboxylation
(c) Saponification
(d) Esterification
SOL:   (c) Oil/fat + Alkali --> Soap + Glycerol.

63. Fat consists of 
(a) Monohydroxy carboxylic acid
(b) Monohydroxy aliphatic carboxylic acid  
(c) Monohydroxy aliphatic, saturated carboxylic acid 
(d) Dihydroxy aliphatic carboxylic acid

64. The alcohol obtained by the hydrolysis of oils and fats is 
 (a) Glycol (b) Glycerol
(c) Propanol (d) Pentanol
SOL:   B

65. Iodine value is related to 
(a) Fats and oils (b) Alcohols 
(c) Esters          (d) Hydrocarbons
SOL:   D

66. Phospholipids are esters of glycerol with             
(a) Three phosphate groups 
(b) Three carboxylic acid residues 
(c) Two carboxylic acid residues and one phosphate group 
(d) One carboxylic acid residue and two phosphate groups
SOL:   D

Vitamins, Hormone and Nucleic Acid Quiz

67. The protein which maintains blood sugar level in the human body
(a) Haemoglobin (b) Oxytocin
(c) Insulin (d) Ptyalin
SOL:   (c) Insulin hormone is secreted by pancreas.

68. Which of the following statements about the assembly of nucleotides in a molecule of deoxyribose nucleic acid (DNA) is correct
(a) A pentose of one unit connects to a pentose of another
(b) A pentose of one unit connects to the base of another
(c) A phosphate of one unit connects to a pentose of another
(d) A phosphate of one unit connects to the base of another
SOL:   C

69. Vitamin A is present in
(a) Cod liver oil  (b) Carrot
(c) Milk            (d) In all of these
SOL:   D

70. Ascorbic acid is a
(a) Vitamin (b) Enzyme
(c) Protein (d) Carbohydrate
SOL:   A
71. The deficiency of vitamin   causes
(a) Beri-beri (b) Scurvy
(c) Rickets (d) Anaemia
SOL:   A

72. Which of the following is not present in nucleic acids
(a) Uracil
(b) 2-aminopyridine
(c) Thymine
(d) Adenine
SOL:   B

73. In nucleic acids, the sequence is
(a) Base-phosphate-sugar (b) Phosphate-base-sugar
(c) Sugar-base-phosphate (d) Base-sugar-phosphate
SOL:   D

74. The segment of DNA which acts as the instructional manual for the synthesis of the protein is
(a) Nucleoside (b) Nucleotide
(c) Ribose (d) Gene
SOL:   B

75. The double helical structure of DNA was proposed by
(a) Watson and Crick (b) Meicher
(c) Emil Fischer (d) Khorana
SOL:   A

76. A segment of DNA molecule which codes or specifies for one polypeptide chain is called
(a) Phosphate group (b) Adenine
(c) Gene (d) Amino acid
SOL:   C

77. Mutation of DNA occurs due to changes in the sequence of one of the following 
(a) Bases
(b) Ribose units
(c) Phosphate units
(d) Sugar units
SOL:   (a) Mutation is a chemical change in the sequence of Nitrogenous bases along the DNA strained which can lead to the synthesis of protein with altered amino acid sequence.

78. Which of the following is not true about vitamins
 (a) They are vital for life 
(b) They help in digestion
(c) They were named by “Funic”
(d) Their deficiency causes diseases
SOL:   B

79. Blood calcium level can be increased by the administration of
(a) Glucogon (b) Calcitonin 
(c) Thyroxine (d) Paratharmone
SOL:   D

80. The first harmone chemically synthesised in the laboratory is
 (a) Cortisone (b) Insuline 
(c) Adrenaline (d) Estrone
81. Nucleic acid is a polymer of
(a) Nucleosides (b)  amino acids
(c) Nucleotides (d) Glucose
SOL:  (c)Nucleic acid is a polymer of nucleotides.

Critical Thinking Questions Quiz

82. Subunits present in haemoglobin are
(a) 2 (b) 3
(c) 4 (d) 5
SOL:  (c) Four sub units are present in haemoglobin.

83. A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid
(a) One (b) Two
(c) Three (d) Four

SOL:  (c) The four bases in m-RNA : adenine, cytosine, guanine and Uracil have been shown to act in the form of triplet; each triplet behaving as a code for the synthesis of a particular amino acid.
84. Chargaff's rule states that in an organism
(a) Amounts of all bases are equal 
(b) Amount of adenine (A) is equal to that of thymine  (T) and the amount of guanine (G) is equal to that of cytosine (C)
(c) Amount of adenine (A) is equal to that of guanine (G) and the amount of thymine (T) is equal to that of cytosine (C) 
(d) Amount of adenine (A) is equal to that of cytosine (C) and the amount of thymine (T) is equal to guanine (G)
SOL:  (b)According to Chargaff’s rule amount of adenine(A) is equal to that of thymin(T) and the amount of guanine(G) is equal to that of cytosine(C).

85. DNA multiplication is called
(a) Translation (b) Transduction
(c) Transcription (d) Replication
SOL:  (d) Multiplication of DNA is called replication.

86. Insulin is a protein which plays the role of 
(a) An antibody (b) A harmone
(c) An enzyme (d) A transport agent
SOL: (b)Insulin is a harmone which decreases sugar level in the blood.