Please refer to Chapter 9 Biomolecules MCQ Class 11 Biology with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 11 Biology. Students should refer to MCQ Questions for Class 11 Biology with Answers to score more marks in Grade 11 Biology exams. Students should read the chapter Biomolecules and then attempt the following objective questions.

MCQ Questions Class 11 Biology Chapter 9 Biomolecules

The Biomolecules MCQ Class 11 Biology provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. Which biomolecule is distributed more widely in a cell?
(a) Chloroplast
(b) RNA
(c) DNA
(d) Spaherosomes

Question. An enzyme brings about
(a) decrease in reaction time
(b) increase in reaction time
(c) increase in activation energy
(d) reduction in activation energy

Question. 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

Question: A nucleotide is formed of
(a) Nitrogen base, sugar and phosphate
(b) Pyrimidine, sugar and phosphate
(c) Purine, sugar and phosphate
(d) Purine, pyrimidine and phosphate

Question: A nucleotide is formed of
(a) Nitrogen base, sugar and phosphate
(b) Pyrimidine, sugar and phosphate
(c) Purine, sugar and phosphate
(d) Purine, pyrimidine and phosphate

Question. Ester linkages occur in
(a) Proteins
(b) Lipids
(c) Nucleic acids
(d) Carbohydrates

Question. Which of the following biomolecules are not strictly macromolecules?
(a) Lipids
(b) Nucleic acids
(c) Proteins
(d) Polysaccharides

Question. 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

Question. An enzyme/protein is formed by chemically bonding together
(a) CO₂
(b) Lipases
(c) Carbohydrates
(d) Amino acids

Question. Which one of the following is a non – reducing carbohydrate?
(a) Maltose
(b) Sucrose
(c) Lactose
(d) Ribose 5 – phosphate

Question. 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

Question. Cellulose is made up of
(a) Fructose
(b) Glucose
(c) Sucrose
(d) Ribose

Question. 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

Question. Which one is a fibrous protein?
(a) Collagen
(b) Haemoglobin
(c) Globulin
(d) Hordein

Question. ATP was discovered by
(a) Bowman
(b) Lipmann
(c) Blackman
(d) Karl Lohmann

Question. Which one of the following is wrongly matched?
(a) Enzyme – Lipopolysaccharide
(b) Phospholipid – Plasma membrane
(c) ATP – Nucleotide derivative
(d) Antibody – Glycoprotein

Question. Which of the following is not a polysaccharide?
(a) Lactose
(b) Starch
(c) Glycogen
(d) Dextrin

Question. A protein having both structural and enzymatic traits is
(a) Collagen
(b) Trypsin
(c) Myosin
(d) Actin

Question. 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

Question. Double hydrogen bond occurs in DNA between
(a) Adenine and guanine
(b) Thymine and cytosine
(c) Adenine and thymine
(d) Uracil and thymine

Question. 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

Question. The bacterial cell wall is formed of
(a) Cellulose
(b) Hemicellulose
(c) Peptidoglycan
(d) Glycogen

Question. Which one is a fibrous protein?
(a) Collagen
(b) Haemoglobin
(c) Globulin
(d) Hordein

Question. Which of the following are the most diverse molecules of a cell?
(a) Mineral salts
(b) Lipids
(c) Proteins
(d) Carbohydrates

Question. 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

Question. Which of the following is not a conjugated protein?
(a) Peptone
(b) Glycoprotein
(c) Chromoprotein
(d) Lipoprotein

Question. Which of the following is not a pyrimidine?
(a) Uracil
(b) Cytosine
(c) Guanine
(d) Thymine

Question. Which of the following statements regarding enzyme inhibition is correct?
(a) Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein
(b) Non-competitive inhibitors often bind to the enzyme irreversibly
(c) Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme
(d) Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate

Question. The minimum amount of energy required to initiate a chemical reaction is called
(a) enzymatic energy
(b) activation energy
(c) substrate energy
(d) initiation energy

Question. Enzymes increase the rate of reaction by
(a) lowering activation energy
(b) increasing activation energy
(c) increasing temperature and pH
(d) decreasing temperature and pH

Question. An example of competitive inhibition of an enzyme is the inhibition of
(a) succinic dehydrogenase by malonic acid
(b) cytochrome oxidase by cyanide
(c) hexokinase by glucose-6-phosphate
(d) carbonic anhydrase by carbon dioxide

Question. Glycogen is a polymer of
(a) glucose
(b) sucrose
(c) galactose
(d) fructose

Question. Length of one turn of the helix in a B-form DNA is approximately
(a) 3.4 nm
(b) 0.34 nm
(c) Both
(d) None of these

Question. The most common secondary structure of proteins is
(a) β-pleated sheet
(b) β-pleated sheet parallel
(c) β-pleated sheet non-parallel
(d) α-helix

Question. A high content of triglycerides are found in
(a) VLDL
(b) LDL
(c) HDL
(d) Chylomicrons

Question. DNA is composed of repeating units of
(a) ribonucleosides
(b) deoxyribonucleosides
(c) ribonucleotides
(d) deoxyribonucleotides

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