Biomolecules Class 11 MCQs Questions with Answers
Question 1.
Which one of the following is wrongly matched?
(a) Enzyme – Lipopolysaccharide
(b) Phospholipid – Plasma membrane
(c) ATP – Nucleotide derivative
(d) Antibody – Glycoprotein
Answer
Answer: (a) Enzyme – Lipopolysaccharide
Question 2.
A functional protein is
(a) Collagen
(b) Ossein
(c) Vitamin
(d) Enzyme
Answer
Answer: (d) Enzyme
Question 3.
Nitrogenous bases present in DNA
(a) Adenine, guanine, cytosine, uracil
(b) Adenine, guanine, cytosine, thymine
(c) Adenine, thymine, uracil
(d) Guanine, uracil
Answer
Answer: (b) Adenine, guanine, cytosine, thymine
Question 4.
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
Answer
Answer: (d) Primary metabolites
Question 5.
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
Answer
Answer: (a) Thymine but no uracil
Question 6.
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
Answer
Answer: (b) Sequence of amino acids
Question 7.
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.
Answer
Answer: (b) Addition of lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonate.
Question 8.
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
Answer
Answer: (b) Phosphate groups at the start of two DNA strands (poles) are in opposite position
Question 9.
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
Answer
Answer: (d) Infection of the plant by Agrobacterium tumefaciens
Question 10.
Double hydrogen bond occurs in DNA between
(a) Adenine and guanine
(b) Thymine and cytosine
(c) Adenine and thymine
(d) Uracil and thymine
Answer
Answer: (c) Adenine and thymine
Question 11.
The most common monomer of carbohydrates is
(a) Sucrose
(b) Fructose
(c) Maltose
(d) Glucose
Answer
Answer: (d) Glucose
Question 12.
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
Answer
Answer: (c) Hormones
Question 13.
Nitrogen is a component of
(a) Carbohydrates
(b) Lipids
(c) Proteins
(d) Polyphosphates
Answer
Answer: (c) Proteins
Question 14.
Maximum iron occurs in
(a) WBC
(b) Bone cells
(c) Protein
(d) RBC
Answer
Answer: (d) RBC
Question 15.
The most abundant mineral of the animal body is
(a) Potassium
(b) Sodium
(c) Calcium
(d) Iron
Answer
Answer: (c) Calcium
Question 16.
The bacterial cell wall is formed of
(a) Cellulose
(b) Hemicellulose
(c) Peptidoglycan
(d) Glycogen
Answer
Answer: (c) Peptidoglycan
Question 17.
Ester linkages occur in
(a) Proteins
(b) Lipids
(c) Nucleic acids
(d) Carbohydrates
Answer
Answer: (b) Lipids
Question 18.
ATP was discovered by
(a) Bowman
(b) Lipmann
(c) Blackman
(d) Karl Lohmann
Answer
Answer: (d) Karl Lohmann
Question 19.
Adenine is
(a) Nucleoside
(b) Purine
(c) Pyrimidine
(d) Nucleotide
Answer
Answer: (b) Purine
Question 20.
Which one is a fibrous protein?
(a) Collagen
(b) Haemoglobin
(c) Globulin
(d) Hordein
Answer
Answer: (a) Collagen
Question 21.
Among the following natural materials, the largest amount of cellulose is found in
(a) Wood
(b) Fruit pulp
(c) Wheat straw
(d) Cotton fibre
Answer
Answer: (d) Cotton fibre
Question 22.
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
Answer
Answer: (d) Alkaloids – Lemon grass oil
Question 23.
Which of the following are the most diverse molecules of a cell?
(a) Mineral salts
(b) Lipids
(c) Proteins
(d) Carbohydrates
Answer
Answer: (c) Proteins
Question 24.
Cellulose is made up of
(a) Fructose
(b) Glucose
(c) Sucrose
(d) Ribose
Answer
Answer: (b) Glucose
Question 25.
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
Answer
Answer: (c) Lactose
Question 26.
Glycogen is a homopolymer made of
(a) Glucose units
(b) Galactose units
(c) Amino acids
(d) Ribose units
Answer
Answer: (a) Glucose units
Question 27.
Which one of the following is a non – reducing carbohydrate?
(a) Maltose
(b) Sucrose
(c) Lactose
(d) Ribose 5 – phosphate
Answer
Answer: (b) Sucrose
Question 28.
Which of the following carbohydrates is not a disaccharide?
(a) Lactose
(b) Maltose
(c) Sucrose
(d) Galactose
Answer
Answer: (d) Galactose
Question 29.
An enzyme/protein is formed by chemically bonding together
(a) CO2
(b) Lipases
(c) Carbohydrates
(d) Amino acids
Answer
Answer: (d) Amino acids
Question 30.
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
Answer
Answer: (a) Adenine, Thymine – Purines
Question 31.
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
Answer
Answer: (a) L-amino acids only
Question 32.
Which of the following biomolecules are not strictly macromolecules?
(a) Lipids
(b) Nucleic acids
(c) Proteins
(d) Polysaccharides
Answer
Answer: (a) Lipids
Question 33.
A protein which lacks a metal is
(a) Glycoprotein
(b) Haemoglobin
(c) Ferredoxin
(d) Cytochrome
Answer
Answer: (a) Glycoprotein
Question 34.
Which of the following is not a conjugated protein?
(a) Peptone
(b) Glycoprotein
(c) Chromoprotein
(d) Lipoprotein
Answer
Answer: (a) Peptone
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