Biomolecules MCQ Questions for Class 11 Biology Chapter 9 with Answers

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NCERT Chapters for Class 11 Biology

Q1. 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

Q2. The most abundant component of a cell is

(A) Lipid
(B) Protein
(C) Water
(D) Cellulose

Q3. Lecithin is a

(A) polysaccharide
(B) protein
(C) nucleic acid
(D) lipid

(D) liquid

Q4. Which of the following is not a pyrimidine?

(A) Uracil
(B) Cytosine
(C) Guanine
(D) Thymine

Q5. Cellulose occurs in

(A) Cell wall
(B) Cell membrane
(C) Cell interior
(D) Tunicates.

(A) Cell wall.

Q6. Which of the following biomolecules are not strictly macromolecules?

(A) Lipids
(B) Nucleic acids
(C) Proteins
(D) Polysaccharides

(A) Lipids

Q7. An enzyme brings about

(A) decrease in reaction time
(B) increase in reaction time
(C) increase in activation energy
(D) reduction in activation energy

(D) reduction in activation energy

Q8. In RNA, thymine is replaced by

(A) Uracil
(B) Guanine
(C) Both
(D) None of these

(A) Uracil

Q9. Glycogen is a homopolymer made of

(A) Glucose units
(B) Galactose units
(C) Amino acids
(D) Ribose units

(A) Glucose units

Q10. A nucleoside is formed of

(A) Phosphate and nitrogen base
(B) Pentose sugar and phosphate
(C) Pentose sugar, phosphate and nitrogen base
(D) Pentose sugar and nitrogen base.

(D) Pentose sugar and nitrogen base.

Q11. Inhibitor binds to the active site of the enzyme. Hence blocking the reaction. This is an example of

(A) allosteric inhibition
(B) feedback inhibition
(C) uncompetitive inhibition
(D) competitive inhibition

(D) competitive inhibition

Q12. 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

(A) lowering activation energy

Q13. Which of the following is a non-reducing sugar?

(A) Lactose
(B) Glucose
(C) Maltose
(D) Sucrose.

(D) Sucrose.

Q14. The most abundant mineral of the animal body is

(A) Potassium
(B) Sodium
(C) Calcium
(D) Iron

Q15. DNA is composed of repeating units of

(A) ribonucleosides
(B) deoxyribonucleosides
(C) ribonucleotides
(D) deoxyribonucleotides

(D) deoxyribonucleotides

Q16. Most abundant organic compound on earth is

(A) Cellulose
(B) Steroids
(C) Protein
(D) Lipids

(A) Cellulose

Q17. Which of the following carbohydrates is not a disaccharide?

(A) Lactose
(B) Maltose
(C) Sucrose
(D) Galactose

(D) Galactose

Q18. Amino acids are formed from

(A) Proteins
(B) Fatty acids
(C) Volatile acid
(D) α < -keto acids.

(D) α < -keto acids.

Q19. NADP contains vitamin?

(A) B1
(B) B2
(C) B3
(D) B12

Q20. 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

(A) succinic dehydrogenase by malonic acid

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