Biomolecules MCQ Questions for Class 11 Biology Chapter 9 with Answers

Find here the NCERT chapter-wise Multiple Choice Questions from Class 11 Biology Book Chapter 9 Biomolecules with Answers Pdf free download. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Biomolecules. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.

NCERT Chapters for Class 11 Biology

Q1. The most abundant component of a cell is

(i) Lipid
(ii) Protein
(iii) Water
(iv) Cellulose

(iii) Water.

Q2. Which of the following is not a pyrimidine?

(i) Uracil
(ii) Cytosine
(iii) Guanine
(iv) Thymine

(iii) Guanine

Q3. Which of the following biomolecules are not strictly macromolecules?

(i) Lipids
(ii) Nucleic acids
(iii) Proteins
(iv) Polysaccharides

(i) Lipids

Q4. In RNA, thymine is replaced by

(i) Uracil
(ii) Guanine
(iii) Both
(iv) None of these

(i) Uracil

Q5. A nucleoside is formed of

(i) Phosphate and nitrogen base
(ii) Pentose sugar and phosphate
(iii) Pentose sugar, phosphate and nitrogen base
(iv) Pentose sugar and nitrogen base.

(iv) Pentose sugar and nitrogen base.

Q6. Enzymes increase the rate of reaction by

(i) lowering activation energy
(ii) increasing activation energy
(iii) increasing temperature and pH
(iv) decreasing temperature and pH

(i) lowering activation energy

Q7. The most abundant mineral of the animal body is

(i) Potassium
(ii) Sodium
(iii) Calcium
(iv) Iron

(iii) Calcium

Q8. Most abundant organic compound on earth is

(i) Cellulose
(ii) Steroids
(iii) Protein
(iv) Lipids

(i) Cellulose

Q9. Amino acids are formed from

(i) Proteins
(ii) Fatty acids
(iii) Volatile acid
(iv) α < -keto acids.

(iv) α < -keto acids.

Q10. An example of competitive inhibition of an enzyme is the inhibition of

(i) succinic dehydrogenase by malonic acid
(ii) cytochrome oxidase by cyanide
(iii) hexokinase by glucose-6-phosphate
(iv) carbonic anhydrase by carbon dioxide

(i) succinic dehydrogenase by malonic acid

Q11. A protein which lacks a metal is

(i) Glycoprotein
(ii) Haemoglobin
(iii) Ferredoxin
(iv) Cytochrome

(i) Glycoprotein

Q12. Glycogen is a polymer of

(i) glucose
(ii) sucrose
(iii) galactose
(iv) fructose

(i) glucose

Q13. Lactose molecule is composed of

(i) Fructose+Fructose
(ii) Glucose+Fructose
(iii) Glucose+Glucose
(iv) Glucose+Galactose.

(iv) Glucose+ Galactose.

Q14. Hydrolysis of starch occurs with the help of

(i) Peptidase
(ii) Amylase
(iii) Sucrose
(iv) Lipase

(ii) Amylase

Q15. Which of the following is not a conjugated protein?

(i) Peptone
(ii) Glycoprotein
(iii) Chromoprotein
(iv) Lipoprotein

(i) Peptone

Q16. Length of one turn of the helix in a B-form DNA is approximately

(i) 3.4 nm
(ii) 0.34 nm
(iii) Both
(iv) None of these

(i) 3.4 nm

Q17. Maximum amount of iron occures in

(i) Proteins
(ii) Bone cells
(iii) Leucocytes
(iv) Erythrocytes.

(iv) Erythrocytes.

Q18. Which of the following influence feedback inhibition of enzyme?

(i) End product
(ii) External factors
(iii) Enzyme
(iv) Substrate

(i) End product

Q19. Maximum iron occurs in

(i) WBC
(ii) Bone cells
(iii) Protein
(iv) RBC

(iv) RBC

Q20. The most basic amino acid is

(i) Arginine
(ii) Glycine
(iii) Histidine
(iv) Glutamine

(i) Arginine

Q21. Immediate source of energy is

(i) ATP
(ii) Glucose
(iii) NADH
(iv) Pyruvic acid.

(i) ATP.

Q22. Which of the following is not a polysaccharide?

(i) Lactose
(ii) Starch
(iii) Glycogen
(iv) Dextrin

(i) Lactose

Q23. Nitrogen is a component of

(i) Carbohydrates
(ii) Lipids
(iii) Proteins
(iv) Polyphosphates

(iii) Proteins

Q24. The Km value of the enzyme is the value of the substrate concentration at which the reaction reaches to

(i) ½ Vmax
(ii) Zero
(iii) ¼ Vmax
(iv) 2 Vmax

(i) ½ Vmax

Q25. The most abundant protein is

(i) Glycine
(ii) Valine
(iii) Arginine
(iv) Collagen

(iv) Collagen.

Q26. A protein having both structural and enzymatic traits is

(i) Collagen
(ii) Trypsin
(iii) Myosin
(iv) Actin

(iii) Myosin

Q27. Proteins perform many physiological functions. For example, some function as enzymes. Which one of the following represents an additional function which some proteins discharge?

(i) Antibiotics
(ii) Pigments making colours of flowers
(iii) Hormones
(iv) Pigments conferring colour to skin

(iii) Hormones

Q28. Enzymes that catalyse removal of groups from substrates by mechanisms other than hydrolysis, and addition of groups to double bonds, are called

(i) lyases
(ii) dehydrogenases
(iii) Both
(iv) None of these

(i) lyases

Q29. The amino acids which are not synthesized in our body are called

(i) Deaminated
(ii) Non-essential
(iii) Essential
(iv) Proteinaceous.

(iii) Essential.

Q30. NADP contains vitamin?

(i) B1
(ii) B2
(iii) B3
(iv) B12

(iii) B3

Q31. Which of the following carbohydrates is not a disaccharide?

(i) Lactose
(ii) Maltose
(iii) Sucrose
(iv) Galactose

(iv) Galactose

Q32. DNA is composed of repeating units of

(i) ribonucleosides
(ii) deoxyribonucleosides
(iii) ribonucleotides
(iv) deoxyribonucleotides

(iv) deoxyribonucleotides

Q33. Which of the following is a non-reducing sugar?

(i) Lactose
(ii) Glucose
(iii) Maltose
(iv) Sucrose.

(iv) Sucrose.

Q34. Inhibitor binds to the active site of the enzyme. Hence blocking the reaction. This is an example of

(i) allosteric inhibition
(ii) feedback inhibition
(iii) uncompetitive inhibition
(iv) competitive inhibition

(iv) competitive inhibition

Q35. Glycogen is a homopolymer made of

(i) Glucose units
(ii) Galactose units
(iii) Amino acids
(iv) Ribose units

(i) Glucose units

Q36. An enzyme brings about

(i) decrease in reaction time
(ii) increase in reaction time
(iii) increase in activation energy
(iv) reduction in activation energy

(iv) reduction in activation energy

Q37. Cellulose occurs in

(i) Cell wall
(ii) Cell membrane
(iii) Cell interior
(iv) Tunicates.

(i) Cell wall.

Q38. Lecithin is a

(i) polysaccharide
(ii) protein
(iii) nucleic acid
(iv) lipid

(iv) liquid

Q39. Which of the following secondary metabolites is wrongly matched?

(i) Pigments – Carotenoids, anthocyanins
(ii) Polymeric substances – Rubber, gums
(iii) Toxin – Abrin, ricin
(iv) Alkaloids – Lemon grass oil

(iv) Alkaloids – Lemon grass oil

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