MCQ Questions for Class 11 Biology: Ch 9 Biomolecules
1. Ester linkages occur in
(a) Proteins
(b) Lipids
(c) Nucleic acids
(d) Carbohydrates
► (b) Lipids
2. Which of the following is not a conjugated protein?
(a) Peptone
(b) Glycoprotein
(c) Chromoprotein
(d) Lipoprotein
► (a) Peptone
3. The bacterial cell wall is formed of
(a) Cellulose
(b) Hemicellulose
(c) Peptidoglycan
(d) Glycogen
► (c) Peptidoglycan
4. A protein which lacks a metal is
(a) Glycoprotein
(b) Haemoglobin
(c) Ferredoxin
(d) Cytochrome
► (a) Glycoprotein
5. The most abundant mineral of the animal body is
(a) Potassium
(b) Sodium
(c) Calcium
(d) Iron
► (c) Calcium
6. Which of the following biomolecules are not strictly macromolecules?
(a) Lipids
(b) Nucleic acids
(c) Proteins
(d) Polysaccharides
► (a) Lipids
7. Maximum iron occurs in
(a) WBC
(b) Bone cells
(c) Protein
(d) RBC
► (d) RBC
8. The naturally occurring form of amino acid in proteins
(a) L-amino acids only
(b) D-amino acids only
(c) Both L and D amino acids
(d) None of these
► (a) L-amino acids only
9. Nitrogen is a component of
(a) Carbohydrates
(b) Lipids
(c) Proteins
(d) Polyphosphates
► (c) Proteins
10. Which one of the following pairs of nitrogenous bases of nucleic acids is wrongly matched with the category mentioned against it?
(a) Adenine, Thymine – Purines
(b) Uracil, Cytosine – Pyrimidines
(c) Guanine, Adenine – Purines
(d) Thymine, Uracil – Pyrimidines
► (a) Adenine, Thymine – Purines
11. Proteins perform many physiological functions. For example, some function as enzymes. Which one of the following represents an additional function which some proteins discharge?
(a) Antibiotics
(b) Pigments making colours of flowers
(c) Hormones
(d) Pigments conferring colour to skin
► (c) Hormones
12. An enzyme/protein is formed by chemically bonding together
(a) CO2
(b) Lipases
(c) Carbohydrates
(d) Amino acids
► (d) Amino acids
13. The most common monomer of carbohydrates is
(a) Sucrose
(b) Fructose
(c) Maltose
(d) Glucose
► (d) Glucose
14. Which of the following carbohydrates is not a disaccharide?
(a) Lactose
(b) Maltose
(c) Sucrose
(d) Galactose
► (d) Galactose
15. Double hydrogen bond occurs in DNA between
(a) Adenine and guanine
(b) Thymine and cytosine
(c) Adenine and thymine
(d) Uracil and thymine
► (c) Adenine and thymine
(a) Adenine and guanine
(b) Thymine and cytosine
(c) Adenine and thymine
(d) Uracil and thymine
► (c) Adenine and thymine
16. Which one of the following is a non - reducing carbohydrate?
(a) Maltose
(b) Sucrose
(c) Lactose
(d) Ribose 5 - phosphate
► (b) Sucrose
17. The introduction of t-DNA into plants involves:
(a) Altering the pH of the soil, then heat shocking the plants
(b) Exposing the plants to cold for a brief period
(c) Allowing the plant roots to stand in water
(d) Infection of the plant by Agrobacterium tumefaciens
► (d) Infection of the plant by Agrobacterium tumefaciens
18. Glycogen is a homopolymer made of
(a) Glucose units
(b) Galactose units
(c) Amino acids
(d) Ribose units
► (a) Glucose units
19. Anti-parallel strands of a DNA molecule mean that
(a) One strand turns anticlockwise
(b) Phosphate groups at the start of two DNA strands (poles) are in opposite position
(c) Phosphate groups of two DNA strands at their ends share the same position
(d) One strand turns clockwise
► (b) Phosphate groups at the start of two DNA strands (poles) are in opposite position
20. Which of the following is required as inducer(s) for the expression of Lac operon?
(a) Glucose
(b) Galactose
(c) Lactose
(d) Lactose and galactose
► (c) Lactose
21. Select the option which is not correct with respect to enzyme action:
(a) Substrate binds with enzyme at its active site.
(b) Addition of lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonate.
(c) A non-competitive inhibitor binds the enzyme at a site distinct from that which binds the substrate.
(d) Malonate is a competitive inhibitor of succinic dehydrogenase.
► (b) Addition of lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonate.
22. Cellulose is made up of
(a) Fructose
(b) Glucose
(c) Sucrose
(d) Ribose
► (b) Glucose
23. Enormous diversity of protein molecules is due to
(a) R groups of amino acids
(b) Sequence of amino acids
(c) Peptide bonds
(d) Amino groups of amino acids
► (b) Sequence of amino acids
24. Which of the following are the most diverse molecules of a cell?
(a) Mineral salts
(b) Lipids
(c) Proteins
(d) Carbohydrates
► (c) Proteins
25. DNA differs from RNA in having
(a) Thymine but no uracil
(b) Uracil but no thymine
(c) Thymine but no cytosine
(d) Cytosine but no guanine
► (a) Thymine but no uracil
26. Which of the following secondary metabolites is wrongly matched?
(a) Pigments – Carotenoids, anthocyanins
(b) Polymeric substances – Rubber, gums
(c) Toxin – Abrin, ricin
(d) Alkaloids – Lemon grass oil
► (d) Alkaloids – Lemon grass oil
27. Metabolic intermediates found in living system which are essential for growth and life is called___________
(a) Saponins
(b) Tannins
(c) Secondary metabolite
(d) Primary metabolites
► (d) Primary metabolites
28. Among the following natural materials, the largest amount of cellulose is found in
(a) Wood
(b) Fruit pulp
(c) Wheat straw
(d) Cotton fibre
► (d) Cotton fibre
29. Nitrogenous bases present in DNA
(a) Adenine, guanine, cytosine, uracil
(b) Adenine, guanine, cytosine, thymine
(c) Adenine, thymine, uracil
(d) Guanine, uracil
► (b) Adenine, guanine, cytosine, thymine
30. Which one is a fibrous protein?
(a) Collagen
(b) Haemoglobin
(c) Globulin
(d) Hordein
► (a) Collagen
31. A functional protein is
(a) Collagen
(b) Ossein
(c) Vitamin
(d) Enzyme
► (d) Enzyme
32. Adenine is
(a) Nucleoside
(b) Purine
(c) Pyrimidine
(d) Nucleotide
► (b) Purine
33. Which one of the following is wrongly matched?
(a) Enzyme – Lipopolysaccharide
(b) Phospholipid – Plasma membrane
(c) ATP – Nucleotide derivative
(d) Antibody – Glycoprotein
► (a) Enzyme – Lipopolysaccharide
34. ATP was discovered by
(a) Bowman
(b) Lipmann
(c) Blackman
(d) Karl Lohmann
► (d) Karl Lohmann