BIO MOLECULES – 4

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

2) Which base is found only in the nucleotides of DNA?
a) Thymine
b) Adenine
c) Guanine
d) Cytosine

3) Which of the following sets of bases is present both in DNA and RNA?
a) Adenine, uracil, thymine.
b) Adenine, guanine, cytosine.
c) Adenine, guanine, uracil.
d) Adenine, guanine, thymine.

4) The relationship between the nucleotide triplets and the amino acids is called
a) Transcription
b) A genetic code.
c) Replication
d) Translation

5) Consider the double helix structure of DNA. The base pairs are
a) Part of the back bone structure.
b) Outside the helix.
c) Inside the helix.
d) None of these .

6) Which of the following statements are wrong ?
a) In sucrose, glucose is present in the furanose form while fructose is present in the pyranose form
b) Sucrose is a non-reducing sugar.
c) In lactose, galactose is the reducing sugar while glucose is the non-reducing sugar.
d) (a),(c) are wrong.

7) Which of the following statements about DNA is not correct ?
a) It has a double helix structure.
b) It undergoes replication.
c) The two strands in a DNA molecule are exactly similar.
d) It contains the pentose sugar, 2-deoxyribose.

8) Which of the following statements about RNA is not correct ?
a) It has a single strand.
b) It does not undergo replication.
c) It does not contain any pyridine base.
d) It controls the synthesis of proteins.

9) If the sequence of bases in DNA is TGAACCCTT then the sequence of bases in m-RNA is
a) ACUUGGGAA
b) TCUUGGGTT
c) ACUUCCCAA
d) None of the above

10) If the sequence of bases in one strand of DNA is ATGACTGTC then the sequence of bases in its complementary strand is
a) TACTGACAG
b) TUCTGUCCUG
c) GUAGRUAUG
d) None of the above.

11) Oils and fats are esters of higher fatty acids with
a) Ethanol
b) Glycol
c) Glycerol
d) Methanol

12) Waxes are esters of higher fatty acids with long chain
a) Monohydric alcohols
b) Dihydric alcohols
c) Trihydric alcohols
d) All of the above.

13) Which of the following is not a wax?
a) Myricyl palmitate.
b) Myricyl cerotate.
c) Tripalmitin.
d) Cetyl palmitate.

14) Lecithin is a
a) Protein
b) Carbohydrate
c) Nucleic acid
d) Phospholipid

15) The chief constituents of cell membranes are
a) Simple triglycerides
b) Waxes
c) Proteins
d) Phospholipids

16) The triglycerides of which of the following saturated fatty acid is not present in oils and fats ?
a) Palmitic acid .
b) Stearic acid.
c) Acetic acid.
d) Myristic acid.

17) The triglycerides of which of the following unsaturated fatty acids are not present in oils and fats?
a) Oleic acid
b) Linolenic acid .
c) Linoleic acid
d) Maleic acid.

18) The fats present in the body act as
a) Heat insulator only.
b) Shock absorber only.
c) Food storage only.
d) All of the above.

19) Candles are made using
a) Bees wax and stearic acid.
b) Paraffin wax and stearic acid.
c) Bees wax and paraffin wax.
d) Bees wax, paraffin wax and stearic acid.

20) The most concentrated source of energy in the human body is
a) Fats
b) Sugars
c) Proteins
d) Nuclei acids

21) Glucose when treated with in presence of dry HCI gas gives and -methylglucosides because it contains
a) an aldehydic group
b)
c) a ring structure
d) five —OH groups.

22) The disaccharide present in milk is
a) Maltose
b) Lactose
c) Sucrose
d) Cellobiose.

23) Which of the following compounds is found abundantly in nature?
a) Cellulose
b) Fructose
c) Starch
d) Glucose

24) On heating glucose with Fehlings solution, we get a precipitate whose colour is
a) Red
b) Yellow
c) Black
d) White

25) Which has the maximum protein content?
a) Cow ‘s milk
b) Groundnut
c) Egg
d) Wheat

26) The bond that determines the secondary structure of a protein is the
a) Co-ordinate bond.
b) Hydrogen bond.
c) Covalent bond.
d) Ionic bond.

27) Glucose is a
a) Monosaccharide
b) Disaccharide
c) Trisaccharide
d) Polysaccharide

28) Which of the following statements about ribose is incorrect ?
a) It is a polyhydroxy compound.
b) It is an aldehyde sugar.
c) It has six carbon atoms .
d) It exhibits optical activity.

29) Which of the following contains nitrogen?
a) Fats
b) Proteins
c) Carbohydrates
d) None

30) Cellulose is a
a) Protein
b) Carbohydrate
c) Simple Sugar
d) All the above

31) Glucose cannot be classified as
a) A hexose .
b) A carbohydrate.
c) An oligosaccharide.
d) An aldose.

32) On heating with conc. HNO3, proteins give a yellow colour. This test is called
a) Oxidising test.
b) Xanthoproteic test .
c)
d) Acid-base test.

33) Which of the following compounds is responsible for the transmission of hereditary characters?
a) RNA
b) DNA
c) Glucose
d) Haemoglobin

34) Which base is found only in the nucleotides of RNA?
a) Adenine
b) Uracil
c) Guanine
d) Cytosine

35) On hydrolysis of starch, we finally get
a) Glucose
b) Fructose
c) Both (a) and (b).
d) Sucrose

36) The coupling between the base units of DNA is through:
a) Hydrogen bonding
b) Electrostatic bonding
c) Covalent bonding
d) van der Waals forces

37) Enzymes take part in a reaction and
a) decrease the rate of a chemical reaction.
b) increase the rate of a chemical reaction.
c) both (a) and (b).
d) None of the above.

38) The term invert sugar refers to an equimolar mixture of
a) D-Glucose and D-galactose
b) D-Glucose and D-fructose
c) D-Glucose and D-mannose
d) D-Glucose and D-ribose.

39) Denaturation of proteins leads to loss of biological activity by the
a) Formation of amino acids
b) Loss of primary structure
c) Loss of both primary and secondary structures
d) Loss of both secondary and tertiary structures

40) Hydrolysis of sucrose gives
a) Two molecules of glucose .
b) Two molecules of fructose.
c) One molecule each of glucose and fructose.
d) One molecule each of glucose and mannose.

41) Which of the following monosaccharides is a pentose?
a) Glucose.
b) Fructose.
c) Arabinose.
d) Galactose.

42) The pairs of bases in DNA are held together by
a) Hydrogen bonds
b) Ionic bonds
c) Phosphate groups
d) Oxygen linkages.

43) Hydrolysis of proteins in the presence of enzymes produces
a) Hydroxy acids .
b) Dicarboxylic acids.
c) Amino acids
d) Aromatic acids.

44) The monomeric units of starch is/are
a) Glucose
b) Fructose
c) Glucose and fructose
d) Mannose

45) Which of the following is an unsaturated acid ?
a) Linoleic
b) Stearic
c) Myristic
d) Lauric

46) The purine base present in RNA is
a) Guanine
b) Thymine
c) Cytosine
d) Uracil

47) If one strand of DNA has the sequence ATGCTTGA, the sequence in the complementary strand would be
a) TACGAACT
b) TCCGAACT
c) TACGTACT
d) TACGTAGT

48) Enzymes in the living systems
a) provide energy.
b) provide immunity .
c) transport oxygen.
d) catalyse biological reactions.

49) Which of the following is the sweetest sugar ?
a) Sucrose
b) Glucose
c) Fructose
d) Maltose

50) Which of the following molecules is capable of forming zwitterions ?
a)
b)
c)
d)

51) The iodine test is shown by
a) Polypeptides
b) Glycogen
c) Starch
d) Glucose

52) Which of the following reagents cannot distinguish between glucose and fructose ?
a)
b)
c)
d) all of these

53) a -D(+)-glucose and b -D(+)-glucose are
a) Enantiomers
b) Geometrical isomers .
c) Epimers
d) Anomers

54) The helical structure of proteins is stabilized by
a) H-bonding
b)
c) ionic bond
d) peptide bond.

55) In polysaccharides, the linkage connecting monosaccharides is called a
a) glycoside linkage
b) nucleoside linkage
c) glycogen linkage
d) peptide linkage.

56) Which amino acid is achiral ?
a) Alanine
b) Valine
c) Proline
d) None of the above.

57) The best solvent for removing a butter stain from cloth is
a)
b)
c)
d)

58) The structural feature which distinguishes proline from other natural a -amino acids is:
a) It is optically inactive.
b) It contains an aromatic group.
c) It is a dicarboxylic acid.
d) It is a secondary amine.

59) Which of the following does not form an oxime ?
a) Glucose.
b) Glucose penta-acetate.
c) Arabinose
d) Galactose

60) Which of the following pairs form the same osazone ?
a) Glucose and fructose.
b) Glucose and galactose.
c) Glucose and arabinose.
d) Lactose and maltose.

61) Fructose gives the silver mirror test because it
a) contains an aldehyde group
b) contains a keto group.
c) undergoes rearrangement to form a mixture of glucose and mannose.
d) none of the above

62) @ When sucrose is heated with conc. HNO3, the product formed is
a) Sucrose nitrate
b) Adlpic acid
c) Oxalic acid
d) Citric acid

63) Which of the following carbohydrates gives a dark blue colour with iodine ?
a) Glucose
b) Cellulose
c) Starch
d) Sucrose

64) 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

65) In lactose, the reducing part is
a) Galactose
b) Glucose
c) Fructose
d) Mannose

66) Which of the following treatment will convert starch directly into glucose ?
a)
b) fermentation by diastase
c) Fermentation by zymase
d) Heating with dil. NaOH

67) Which compound is not a lipid ?
a) Lecithin
b) Lysine
c) Cerebroside
d) Cephalin

68) Reduction of glucose with NaBH4 gives
a) Sorbitol
b) Mannitol
c) n-Hexane
d) Both (a) and (b)

69) Glucose forms many derivatives. The derivative which will help to prove the furanose structure is
a) Osazone
b) Benzoyl
c) Acetyl
d) isopropylidene

70) In glycine, the basic group is
a)
b)
c) —COOH
d)

71) At the isoelectric point, amino acids are present as
a)
b)
c)
d)

72) The relation of the isoelectric point of an amino acid, to its solubility is
a) the two are not related.
b) an amino acid is least soluble at its isoelectric point.
c) an amino acid has the maximum solubility at the isoelectric point
d) solubilities of only some amino acids depend on it.

73) Which of the following does not exist as a zwitterion ?
a) Glycine
b) Alanine
c) Sulphanilic acid
d) p-Aminobenzoic acid

74) A certain compound gives a negative test with ninhydrin and a positive test with Benedicts solution. The compound is
a) A protein
b) A monosacchride
c) A lipid
d) An amino acid

75) Sangers reagent is used for the identification of the
a) N-terminal of a peptide chain
b) C-terminal of a peptide chain
c) side chain of amino acids
d) molecular weight of the peptide chain

76) The number of tripeptides formed by three different amino acids are
a) Three
b) Four
c) Five
d) Six

77) Lactose on hydrolysis gives
a) Glucose
b) Fructose
c) Galactose
d) Both (a) and (c)

78) Which of the following is not a chromophore?
a) —N = N—
b) —NO
c)
d)

79) Which of the following groups is not an auxochrome ?
a)
b) -OH
c)
d)

80) Which of the following statements is not true ?
a) The colour of a dye is the colour of the light it reflects
b) the colour of a dye is the colour of the light it absorbs
c) Blue is the complementary colour of yellow
d)

81) Which of the following is a natural dye?
a) Phenolphthalein
b) Alizarin
c) Martius yellow
d) Malachite green.

82) To which class of dyes does Martius yellow belong?
a) Azo dyes
b) Triphenylmethane dyes
c) Phthalein dyes
d) Nitro dyes.

83) Which of the following is an azo dye?
a) Organe-I
b) Malachite green
c) Indigo
d) Martius yellow.

84) Indigo is an example of a
a) Direct dye
b) Ingrain dye
c) Vat dye
d) Mordant eye

85) Dyes, which are prepared right on the fabric during the dyeing process, are called
a) Direct dyes
b) Azo dyes
c) Disperse dyes
d) Basic dyes

86) A dye which, in conjunction with different metal ions, imparts different colours to the fabric is called a
a) Vat dye
b) Disperse dye
c) Mordant dye
d) Direct dye.

87) The dyes which are applied to the fabric in the colourless reduced state and then oxidised to the coloured state are called
a) Vat dyes
b) Disperse dyes
c) Triphenylmethane dyes
d) Azo dyes.

88) Which one is an acidic dye?
a) Methyl orange
b) Congo red
c) Orange-1
d) All the three

89) The compound used to fix a dye to the fabric is called a
a) Mordant
b) Lake
c) Bleaching agent
d) Oxidising agent

90) Which of the following is a disperse dye?
a) Congo red
b) Alizarin
c) Butter yellow
d) Celliton fast pink B

91) Which of the following is an ingrain dye?
a) Alizarin
b) Celliton fast blue B
c) Para red
d) Indigo.

92) Fibre reactive dyes are derivatives of
a) anthraquinone
b) 2, 4-dichloro-1, 3, 5-triazine
c) 2, 4, 6-triamino-1, 3, 5-triazine
d) naphthalene

93) Red inks are prepared from
a) Congo red
b) Aniline
c) Para red
d) Eosin

94) A dye which is obtained from a plant largely grown in India is
a) Indigo
b) Turmeric
c) Malachite green
d) Martius yellow

95) Alizarin gives a red colour by mordanting it with the sulphate of a metal. The metal ion is
a)
b)
c)
d)

96) Which of the following is a direct dye?
a) Congo red
b) Martius yellow
c) Phenolphthalein
d) Both (a) and (b)

97) The most widely used antipyretic is
a) Salicylic acid
b) Phenacetin
c) Paracetamol
d) Aspirin.

98) The drugs used to get relief from pain are called
a) Antipyretics
b) Analgesics
c) Antibiotics
d) Antiseptics

99) The fermentation of milk during curd formation is catalyzed by the enzyme
a) Lactose
b) Diastase
c) Lactic mucin
d) none of these

100) The first hormone to be isolated and also the first to be synthesized in the laboratory was
a) Cortisone
b) Testosterone
c) Insulin
d) Adrenaline


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