Ch- 14 Biomolecules
1. Which of the following sugar is known as dextrose ?
(a) Glucose (b) Fructose (c) Ribose (d) Sucrose
2. ∝-D(+) glucose and β - D(+) glucose are
(a) geometrical isomers (b) enantiomers (c) anomers (d) optical isomers.
3. Assertion (A) : Sucrose is a non- reducing sugar.
Reason (R) : Sucrose has glycosidic linkage.
(a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct
explanation of the Assertion (A).
(b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the
correct explanation of the Assertion (A).
(c) Assertion (A) is correct, but Reason (R) is incorrect statements.
(d)Assertion (A) is incorrect, but Reason (R) is correct statements.
4. Name the disaccharide which on hydrolysis gives two molecules of glucose.
5. Write the name of linkage joining two monosaccharides.
6. What is the basic structural difference between glucose and fructose ?
7. Write the products obtained after hydrolysis of lactose.
OR
Write the name of two monosaccharides obtained on hydrolysis of lactors sugar.
8. Define the following with an example of :
Polysaccharides
OR
Define the following term : Polysaccharides
9. Write the product when D- glucose reacts with conc. HNO3.
10. Write the structural difference between starch and cellulose.
11.Which one of the following is a disaccharide : Starch, Maltose, Fructose, Glucose ?
12. Write the product obtained when D- glucose reacts with H2N-OH.
13. Which one of the following is a monosaccharide:
14. Which of the two components of starch is water soluble ?
15. Write the product formed on reaction of D-glucose with Br2 water.
16. Write the product formed when glucose is treated with Hl.
17. Define the following term : Anomers
18. Define the following term : Invert sugar
19. What is a glycosidic linkage ?
20. Name two components of starch.
21. Define the following terms :
(i) Oligosaccharides
(ii) Invert sugar
22. Write the reactions showing the presence of following in the open structure of glucose :
(i) an aldehyde group
(ii) a primary alcohol.
23. Enumerate the reactions of glucose which cannot be explained by its open chain structures.
24. Write chemical reactions to show that open structure of D-glucose contains the following :
(i) Straight chain
(ii) Five alcohol groups
(iii) Aldehyde as carbonyl group.
25. What happens when D- glucose is treated with the following reagents ?
(a) Br2 water (b) (CH3CO)2O
26. Define the following terms :
(i) Glycosidic linkage (ii) Invert sugar (iii) Oligosaccharides
27. Complete the following analogy :
Curdling of milk : A : : ∝- helix : B
(a) A : Primary structure, B : Secondary structure
(b) A : Denatured protein, B : Primary structure
(c) A: Secondary structure, B : Denatured protein
(d) A : Denatured protein , B : Secondary structure
28. Amino acids which cannot be synthesized in the body and must be obtained through diet are
known as
(a) acidic amino acids
(b)essential amino acids
(c) basic amino acids
(d)non-essential amino acids.
29. Peptide linkage is present in
(a) carbohydrates (b) vitamins (c) protein (d) rubber.
30. Amino acids are
(a) acidic (b) basic (c) amphoteric (d) neutral.
31. What is the difference between fibrous protein and globular protein ?
32. Give one example each for fibrous protein and globular protein.
33. Amino acids show amphoteric behaviour. Why ?
34. What is the difference between acidic amino acids and basic amino acids ?
35. What type of linkage is responsible for the formation of proteins ?
36. Define the following term :
Essential amino acids
37. Define the following term :
Denaturation of proteins
38. Define the following term :
Amino acids
39. Define the following with an example of each :
(i) Denatured protein (ii) Essential amino acids
40. (a) Amino acids show amphoteric behaviour. Why ?
(b)Write one difference between ∝-helix and β - pleated structures of proteins.
41. Differentiate between the following:
(i) Amylose and Amylopectin
(ii) Peptide linkage and Glycosidic linkage
(iii) Fibrous proteins and Globular proteins.
42. Define the following terms as related to proteins :
(i) Peptide linkage (ii) Primary structure (iii) Denaturation
43. What are essential and non-essential amino acids ? Give two examples of each.
44. (a) Give two differences between globular and fibrous proteins.
(b) What change occurs in the nature of egg protein on boiling ?
45. Define the following term :
Enzymes
46. Why vitamin C cannot be stored in our body ?
47. Write the name of vitamin whose deficiency causes bone deformities in children.
48. Write the name of the vitamin whose deficiency causes bleeding of gums.
49. Deficiency of which vitamin causes night-blindness ?
50. Deficiency of which vitamin causes rickets ?
51. Deficiency of which vitamin causes scurvy ?
52. Define the following term :
Vitamins
53. Why are vitamin A and vitamin C essential for us ?
54. Name the deficiency diseases resulting from lack of vitamins A and E in the diet.
55. Name one of the water soluble vitamin which is powerful antioxidant. Give its one natural
source.
56. Name the only vitamin which can be synthesized in our body. Name the disease caused due to
the deficiency of this vitamin.
57. How are hormones and vitamins different in respect of their source and functions ?
58. How are vitamins classified ? Name the vitamin responsible for the coagulation of blood.
59. The base which is present in DNA but not in RNA, is
(a) cytosine (b) guanine (c) adenine (d) thymine
60. Nucleic acids are polymer of
(a) amino acids (b) nucleosides (c) nucleotides (d) glucose.
61. Nucleosides are composed of
(a) a pentose sugar and phosphoric acid
(b)a nitrogenous base and phosphoric acid
(c) a nitrogenous base and a pentose sugar
(d) a nitrogenous base, a pentose sugar and phosphoric acid.
62. What is difference between a nucleoside and nucleotide ?
63. What type of linkage is present in nucleic acids ?
64. Name of the base that is found in nucleotide of RNA only.
65. Define the following term :
Nucleoside
66. Mention one important function of nucleic acids in our body.
67. Write the structural and functional difference between DNA and RNA.
68. Give the plausible explanation for the following:
(a) Glucose doesn’t give 2, 4 – DNP test.
(b)The two strands in DNA are not identical but are complementary.
69. Differentiate between following :
(i) Amylose and Amylopectin
(ii) Globular protein and Fibrous protein
(iii) Nucleotide and Nucleoside
CBSE Sample Questions
1. Which one of the following reactions is not explained by the open chain structure of glucose ?
(a) Formation of pentaacetate of glucose with acetic anhydride
(b) Formation of addition product with 2, 4 DNP reagent.
(c) Silver mirror formation with Tollen’s reagent
(d) Existence of alpha and beta forms of glucose
2. Which of the following is a polysaccharide ?
(a) Glucose (b) maltose (c) glycogen (d) lactose
3. Which one of the following statements is correct about sucrose ?
(a) It can reduce Tollen’s reagent, however cannot reduce Fehling’s reagent.
(b) It undergoes mutarotation like glucose and fructose.
(c) It undergoes inversion in the configuration on hydrolysis.
(d) It is laevorotatory in nature.
4. In the following reaction, identify A and B.
5. Dissacharides that are reducing in nature are
(a) sucrose and lactose
(b)sucrose and maltose
(c) lactose and maltose
(d)sucrose, lactose and maltose.
6. Assertion : Glucose reacts with hydroxylamine to form an oxime and also adds a molecule of
hydrogen cyanide to give cyanohydrins.
Reason : The carbonyl group is present in the open chain structure of glucose.
(a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct
explanation of the Assertion (A).
(b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct
explanation of the Assertion (A).
(c) Assertion (A) is correct, but Reason (R) is incorrect statements.
(d)Assertion (A) is incorrect, but Reason (R) is correct statements.
7. Which of the following statements is correct ?
(a) Fibrous proteins are generally soluble in water.
(b)Albumin is an example of fibrous protein.
(c) In fibrous proteins, the structure is stabilized by hydrogen bonds and disulphide bonds.
(d)pH does not affect the primary structure of protein.
8. Curdling of milk is an example of
(a) breaking of peptide linkage
(b)hydrolysis of lactose
(c) breaking of protein into amino acids
(d)denaturation of protein
9. Name the species formed when an aqueous solution of amino acid is dissolved in water ?
10. Three amino acids are given below:
Alanine : CH3CH(COOH)(NH2),
Aspartic acid : HOOC – CH2CH(COOH)(NH2) and
Lysine : H2N – (CH2)4 – CH(COOH)(NH2)
(i) Make two tripeptides using these amino acids and mark the peptide linkage in both
cases.
(ii) Represent alanine in th zwitter ionic form.
11. Match the following :
I II
(i) Amino acids (A) Protein
(ii) Thymine (B) Nucleic acid
(iii) Insulin (C) DNA
(iv) Phosphodiester linkage (D) Zwitter ion
(v) Uracil
Which of the following is the best matched options ?
(a) (i) – A, (v)- D, (iii) – C, (iv)- B
(b) (i) – D, (ii) – C, (iii) – A, (iv) –B
(c) (i)- D, (v)- D, (iii)- A, (iv) – B
(d)(i)- A, (ii)- C, (iii)- D, (iv)- B
12. Assertion : The two strands are complementary to each other .
Reason : The hydrogen bonds are formed between specific pairs of bases.
(a) Assertion and reason both are correct statements and reason is correct explanation for
assertion.
(b)Assertion and reason both are correct statements but reason is not correct explanation for
assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d)Assertion is wrong statement but reason is correct statement.
13. Assertion : The two strands in double strand helix structure of DNA are complementary to
each other.
Reason : Disulphide bonds are formed between specific pairs of bases.
(a) Assertion and reason both are correct statements and reason is correct explanation for
assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for
assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
14. Name the unit formed by the attachment of a base to 1’ position of sugar in a nucleoside.
