1) The enzymes are proteins that catayse bio-chemical processes. The enzyme which is present in tears which protects the eye from bacterial infection is
a) lysozyme
b) zymase
c) lipase
d) diastase

2) The number of amino acid residues in insulin
a) 10
b) 20
c) 51
d) 100

3) Insulin contains 2% by weight of sulphur. If insulin contains 4 atoms of sulphur per molecule, what would be the approximate molecular mass of insulin?
a) 6400
b) 4800
c) 3200
d) 320

4) The enzyme used to dissolve blood clots is
a) streptokinase
b) tyrosinase
c) phenyl-alanine hydroxylase
d) trypsin

5) The enzyme which catalyses the conversion of glucose to alcohol is
a) diastase
b) maltase
c) zymase
d) invertase

6) The vital force theory was propounded by
a) Wohler
b) Berzelius
c) Kolbe
d) Berthelot

7) Ammonium cyanate on heating gives
a) Urea
b) Acetamide
c) Hydrazine
d) Formamide

8) The credit for preparing the first organic compound in the laboratory went to
a) Berzelius
b) Wohler
c) Kolbe
d) Berthelot

9) Which of the following names is associated with the synthesis of the first organic compound from its elements ?
a) Kolbe
b) Berthelot
c) Wohler
d) Berzelius

10) The enzyme ptyalin used for digestion of food is present in.
a) Saliva
b) Blood
c) Intestine
d) Adrenal glands

11) @ When a mixture of potassium cyanate and ammonium chloride is heated, it gives
a) Urea
b) Methanamide
c) Ethanamide
d) Ethanamine

12) The slow decomposition of complex organic compounds into simpler ones by enzymes is known as
a) Condensation
b) Dehydration
c) Fermentation
d) Polymerization.

13) In the conversion of starch to ethyl alcohol, the following enzymes are used

a) Invertase, Zymase, Emulsin
b) Maltase, Zymase, Emulsin
c) Diastase, Maltase, Zymase
d) Invertase, Diastase, Zymase.

14) The most favourable conditions for alcohol fermentation of sugar are
a) High concentration of sugar solution, control of temperature, plenty of air
b) Low concentration of sugar solution, control of temperature, absence of air
c) Low concentration of sugar solution, control of temperature, plenty of air
d) None of the above

15) Enzymes
a) have optimum activity at body temperature.
b) consists of nucleic acids.
c) carbohydrates.
d) have all these properties .

16) In nucleic acids, the sequence is
a) Phosphate—Base—sugar
b) Sugar—Base—phosphate
c) Base—sugar—phosphate
d) Base–Phosphate—Sugar

17) Saponification of coconut oil yields glycerol and
a) Palmitic acid
b) Sodium palmitate
c) Oleic acid
d) Stearic acid

18) Which one of the following Is not a protein ?
a) Wool.
b) Nail
c) Hair
d) DNA

19) Which of the following statements are true ?
a) Maltose forms an osazone.
b) Lactose undergoes mutarotation.
d) All are correct.

20) The secondary structure of protein refers to
a) Mainly denatured proteins and structure of prosthetic groups.
b) 3D structure, especially the bond between amino acid residues that are distinct in the polypeptide chain.
c) Linear sequence of amino acid residues in the polypeptide chain.
d) Regular folding patterns of continuous portions of the polypeptide chain.


Of the following statements about enzymes which ones are true?

(i) Enzymes lack nucleophilic groups.

(ii) Enzymes are highly specific both in binding chiral substrates and in catalysing their reactions.

(iii) Enzymes catalyse chemical reactions by lowering the energy of activation .

(iv) Pepsin is a proteolytic enzyme .
a) (I) and (iv)
b) (i) and (iii)
c) (ii), (iii) and (iv).
d) (i)

22) Table sugar is a
a) disaccharide of D-glucose and D-fructose.
b) a monosaccharide.
c) a disaccharide containing two glucose units.
d) D-Glucose .

23) Which one of the following is responsible for maintaining a normal blood sugar level in the human body ?
a) Riboflavin.
b) Insulin
c) Fats
d) Hormones

24) A protein is a polymer of
b) Carbohydrates
c) Vitamins
d) Minerals

25) The base adenine occurs in
a) DNA only
b) RNA only
c) DNA and RNA
d) Protein

26) Which of the following is not present in RNA ?
a) Uracil
b) Ribose
c) Thiamine
d) Phosphate

27) a -D-Glucose and b -D-glucose differ from each other due to a difference in one carbon with respect to its …
a) Size of hemiacetal ring
b) Number of OH groups
c) Configuration
d) Conformation


Predict which one of the following molecules is most likely to organise and form a bilayer

membrane structure ?

  1. (ii)



a) I
b) II
c) III
d) IV

29) Enzymes belong to which class of compounds ?
a) Polysaccharides
b) Polypeptides
c) Polynitro heterocyclic compounds.
d) Hydrocarbons

30) Glucose reacts with acetic anhydride to form
a) Monoacetate
b) Tetra-acetate
c) Penta-acetate
d) Hexa-acetate

31) In nucleic acids, the nucleotides are linked to one another through
a) Hydrogen bond
b) Peptide bond
c) Glycosidic linkage
d) Phosphate groups

32) Which of the following does not reduce Benedicts solution ?
a) Glucose
b) Fructose
c) Sucrose
d) Aldehyde

33) The enzyme which converts glucose and fructose into ethyl alcohol is
a) Diastase
b) Invertase
c) Maltase
d) Zymase

34) The latest discovery in cytology is that of
a) respiration
b) the genetic code
c) enzymes
d) none of the above.

35) Insulin
a) consists of two peptide chains containing 21 and 30 amino acid residues respectively.
b) is a protein hormone.
c) regulates glucose level in the blood.
d) All are correct.

36) The function of enzymes in the living system is to
a) transport oxygen
b) provide immunity
c) catalyse biochemical reactions
d) provide energy.

37) Lipids are
a) Nucleic acids occurring in plants
b) Proteins occurring in animals
c) Carbohydrates occurring in plants
d) Fats of natural origin

38) Oleic, stearic and palmitic acids are
a) Nucleic acids
b) Amino acids
c) Fatty acids
d) None

39) Which of the following is not present in a nucleotide ?
a) Guanine
b) Cytosine
c) Adenine
d) Tyrosine

40) The Molisch test is answered by
a) All carbohydrates
b) Sucrose
c) Fructose
d) Glucose

41) Which of the following statements is incorrect ?
a) Enzymes are organic catalysts
b) Enzymes have a very large turnover number
c) Enzymes action is specific.
d) Enzymes always require a coenzyme in their catalytic action.

42) The change in the optical rotation (with time) of a freshly prepared solution of sugar is known as
a) Specific rotation
b) Inversion
c) Rotatory motion
d) Mutarotation

43) Hydrolysis of sucrose is called
a) Hydration
b) Saponification
c) Esterification
d) Inversion

44) Which of the following is a test for proteins ?
a) Beilstein test
b) Biuret test
d) Molisch test

45) DNA has deoxyribose, a base and the third compound is
a) Phosphoric acid.
b) Ribose
c) Adenine
d) Thymine

46) In DNA, the complementary bases are :
a) Uracil and adenine : cytosine and guanine.
b) Adenine and thymine: guanine and cytosine.
c) Adenine and thymine : guanine and uracil.
d) Adenine and guanine : thymine and cytosine.

47) Glucose molecule reacts with X number of molecules of phenylhydrazine to yield osazone. The value of X is
a) Three
b) Two
c) One
d) Four

48) The acid showing salt-like character in aqueous solution is
a) Acetic acid
b) Benzoic acid
c) Formic acid

49) Which substance is not present in nucleic acid
a) Cytosine
b) Adenine
c) Thymine
d) Guanidine

50) Which of the following is not an amino acid ?
a) Glycine
b) Alanine
c) Histidine
d) Benzidine

51) The rapid interconversion of a -D-glucose and b – D-glucose in solution is known as
a) Razemization
b) Asymmetric induction
c) Fluxional isomerism
d) Mutarotation

52) Peptides on hydrolysis give
a) Amines
b) Amino acids
c) Ammonia
d) Alcohols

53) Insulin, a hormone, is chemically a
a) Fat
b) Steroid
c) Protein
d) Carbohydrate

54) Glucose gives the silver mirror test with Tollens reagent. It shows the presence of
a) An acid group.
b) An alcoholic group.
c) A ketonic group.
d) An aldehydic group.

55) The main structural feature of proteins is
a) Ester linkage
b) Ether linkage
c) Peptide linkage
d) All of these

56) The double helical structure of DNA was proposed by
a) Watson and Crick
b) Meicher
c) Emil Fischer
d) Khorana

57) A segment of a DNA molecule which codes or specifies for one polypeptide chain is called a/an
a) Phosphate group
b) Adenine
c) Gene
d) Amino acid

58) What is the monomer of a polypeptide ?
a) Amino acid
b) Glucose
c) Nucleoside
d) Nucleotide

59) Enzymes are essential as biocatalysts. They function in an
b) Organic medium.
c) Aqueous medium under extreme pH conditions.
d) None of these .

60) Assuming sweetness of the cane sugar to be 10, the sweetness of glucose is
a) 15
b) 1.5
c) 12.5
d) 7.5

61) Which compound can exist in a dipolar (zwitterion) structure ?

62) The segment of DNA which acts as the instruction manual for the synthesis of the protein is a
a) Nucleoside
b) Nucleotide
c) Ribose
d) Gene

63) Lack of essential amino acids in the diet leads to the disease
a) Night blindness
b) Pernicious anaemia
c) Kwashiorkor
d) Sickle cell anaemia

64) The enzyme which breaks down starch to maltose is
a) Maltase
b) Zymase
c) Diastase
d) Invertase

65) Amino acids are the building blocks of
a) Carbohydrates
b) Vitamins
c) Fats
d) Proteins

66) Which carbohydrate is an essential constituent of plant cells ?
a) Starch
b) Cellulose
c) Sucrose
d) Vitamins

67) The commonest disaccharide has the molecular formula

68) Which enzyme is used to dissolve blood clots?
a) Streptokinase
b) Tyrokinase
c) Phenylalanine
d) Hydroxylase

69) Excess of glucose is stored in the liver as
a) Amylase
b) Glycogen
c) Amylopectin
d) Cellulose

70) Vitamin B6 is known as
a) Pyridoxine
b) Thiamine
c) Riboflavin
d) Tocopherol

71) Aspirin is
a) An alcohol
b) An ester
c) An alkyl halide
d) An anti-oxidant

72) Salol can be used as an
a) Antiseptic
b) Antipyretic
c) Both
d) None

73) The digestion of fat in the intestines is aided by
a) Diffusion
b) Protection
c) Peptization
d) Emulsification

74) Amino acids usually exist in the form of zwitterions. The means that they consist of
a) The basic NH2 group and acidic COOH group
The basic NH3+ group and the acidic COO group
Basic COO group and acidic – NH3 group
d) None of the given


75) Decarboxylation of glycine yields
a) CH
d) None of these

76) The most common disaccharide has the molecular formula
a) C10 H8 O4
C10 H20 O12
C18 H22 O12
C12 H22 O11

77) A carbohydrate may be regarded as
a) An aromatic compound
b) a polyfunctional compound
c) An alicyclic compound
d) All of these

78) Glucose or fructose is converted into C6H5OH in the presence of
a) Diastase
b) Invertase
c) Lactose
d) Gluconic acid

79) Glucose and Mannose are
a) Optical isomers
b) Anomers
c) Epimers
d) None of these

80) When sucrose is heated with concentrated HNO3, the product formed is
a) Formic acid
b) Tartaric acid
c) Oxalic acid
d) Citric acid

81) The set of chemical reactions by which the various molecules of the cell are synthesized is called
a) Anabolism
b) Catabolism
c) Metabolism
d) All the three above.

82) The energy currency of the cell is
a) ATP
b) ADP
c) AMP
d) None of the above.

83) Mark the incorrect statement about ATP
a) It is a nucleotide
b) Energy is stored in the cell in form of ATP.
c) The enzyme catalysed hydrolysis of ATP to ADP and AMP is accompanied by absorption of energy
d) It contains the purine adenine

84) Adenosine triphosphate (ATP) is a
a) Nucleotide
b) Nucleic acid
c) Nucleoside
d) None of the above.

85) Two reactions are said to be coupled if

86) The source of energy in cellular reactions is
a) Heat energy
b) Light energy
c) Chemical energy
d) None of the above

87) The hydrolysis of adenosine triphosphate involves the rupture of
a) P—N—P bond
b) Base-sugar bond
c) P—O—P bond
d) Sugar-phosphate bond

88) Biological reactions associated with positive D g are called
a) Exothermic
b) Endergonic
c) Exergonic
d) Endothermic

89) Carbohydrates are synthesized in plants by a process called
a) Photoaddition.
b) Photocyclization
c) Photosynthesis
d) Photodegradation

90) The raw materials for photosynthesis are
b) Chlorophyll alone

91) Photosynthesis is sensitized by
a) Chlorophyll
b) Oxygen
c) Porphyrins
d) Sunlight

92) The by-product of photosynthesis is
a) Ozone
b) Oxygen
c) Carbon dioxide
d) Carbon monoxide.

93) In which of the following parts of the plant cells does photosynthesis occur ?
a) Mitochondrion
b) Nucleus
c) Chloroplast
d) Cellular membranes

94) Oxygen balance in the atmosphere is maintained by a process called
a) Photosynthesis
b) Protein synthesis
c) Amino acid synthesis
d) Fat synthesis

95) Saliva contains
a) Amylases or ptyalins
b) Trypsin
c) Blue fluid
d) Vitamins.

96) The food which is a common source of carbohydrates, fats and proteins is
a) Rice
b) Milk
c) Egg
d) Ghee.

97) Saliva helps in the digestion of
a) Fats
b) Starch
c) Proteins
d) Vitamins

98) The human digestive system does not hydrolyse
a) Starch
b) Cellulose
c) Maltose.
d) Glycogen

99) Gastric juice contains
a) Strong hydrochloric acid
b) Bile acids
c) Fatty acids.
d) Phosphoric acid

100) The end product of protein digestion is
a) Peptides
b) Peptones
c) Proteases

Answer :


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