Class 12 Chemistry MCQ Chapter 10 Biomolecules
Get exam-ready with our Class 12 Chemistry MCQ Chapter 10 Biomolecules English Medium collection, specially created for AHSEC Higher Secondary students. This article contains a wide range of important multiple-choice questions (MCQs) with answers to help students strengthen their understanding of one of the most scoring chapters in Organic Chemistry.
The Biomolecules chapter covers essential topics such as carbohydrates, proteins, amino acids, vitamins, enzymes, nucleic acids, and their significance in living organisms. Through these carefully selected MCQs, students can revise important concepts, understand the structure and functions of biomolecules, and become familiar with the types of objective questions commonly asked in board examinations.
Designed according to the latest AHSEC syllabus and examination pattern, these MCQ solutions provide an excellent opportunity for self-assessment and revision. Regular practice will help students improve their conceptual clarity, increase accuracy, and develop the confidence needed to perform well in examinations.
Whether you are preparing for school tests, unit tests, or the AHSEC Higher Secondary Final Examination, these Chapter 10 Biomolecules MCQs will serve as a valuable study resource for achieving better results in Chemistry.
Part II
Class 12 Chemistry MCQ Chapter 10 Biomolecules
VSA & MCQ
I. Short Question-Answer
Q. What are biomolecules?
Ans: Chemical compounds present in living organisms.
Q. What are carbohydrates?
Ans: Polyhydroxy aldehydes or ketones.
Q. What is glucose?
Ans: A monosaccharide with formula C₆H₁₂O₆.
Q. What is fructose?
Ans: A ketohexose sugar.
Q. What are monosaccharides?
Ans: Simple sugars that cannot be hydrolysed further.
Q. What are disaccharides?
Ans: Sugars formed by two monosaccharide units.
Q. Example of disaccharide.
Ans: Sucrose
Q. What are polysaccharides?
Ans: Carbohydrates with many monosaccharide units.
Q. Example of polysaccharide.
Ans: Starch
Q. What is glycosidic linkage?
Ans: Linkage between two sugar units.
Q. What are proteins?
Ans: Polymers of amino acids.
Q. What are amino acids?
Ans: Compounds containing –NH₂ and –COOH groups.
Q. What is peptide bond?
Ans: Bond between amino acids (–CO–NH–).
Q. What is primary structure of protein?
Ans: Sequence of amino acids.
Q. What is secondary structure?
Ans: α-helix or β-sheet arrangement.
Q. What is tertiary structure?
Ans: 3D folding of protein.
Q. What is quaternary structure?
Ans: Association of multiple polypeptides.
Q. What are enzymes?
Ans: Biological catalysts.
Q. What are vitamins?
Ans: Organic compounds required in small amounts.
Q. What are fats?
Ans: Esters of fatty acids and glycerol.
Q. What are lipids?
Ans: Fat-like substances insoluble in water.
Q. What is denaturation of protein?
Ans: Loss of biological activity due to structural change.
Q. What is nucleic acid?
Ans: Biomolecules storing genetic information.
Q. Types of nucleic acids.
Ans: DNA and RNA
Q. What is DNA?
Ans: Deoxyribonucleic acid carrying genetic information.
Q. What is RNA?
Ans: Ribonucleic acid involved in protein synthesis.
Q. What is nucleotide?
Ans: Unit of nucleic acids.
Q. What is base pairing?
Ans: Specific pairing of nitrogen bases.
Q. What is mutarotation?
Ans: Change in optical rotation of glucose solution.
Q. What is reducing sugar?
Ans: Sugar that reduces Tollens’ or Fehling’s reagent.
II. Multiple Choice Questions (MCQs)
Q. Biomolecules are present in:
(a) Non-living
(b) Living organisms
(c) Metals
(d) Gases
Ans: (b)
Q. Glucose is a:
(a) Disaccharide
(b) Monosaccharide
(c) Polysaccharide
(d) Protein
Ans: (b)
Q. Sucrose is:
(a) Monosaccharide
(b) Disaccharide
(c) Polysaccharide
(d) Protein
Ans: (b)
Q. Starch is:
(a) Protein
(b) Lipid
(c) Polysaccharide
(d) Vitamin
Ans: (c)
Q. Amino acids form:
(a) Lipids
(b) Proteins
(c) Vitamins
(d) Carbohydrates
Ans: (b)
Q. Peptide bond is:
(a) –CO–NH–
(b) –COOH
(c) –NH₂
(d) –OH
Ans: (a)
Q. Enzymes are:
(a) Lipids
(b) Proteins
(c) Carbohydrates
(d) Vitamins
Ans: (b)
Q. DNA stores:
(a) Energy
(b) Information
(c) Heat
(d) Mass
Ans: (b)
Q. RNA helps in:
(a) Storage
(b) Transport
(c) Protein synthesis
(d) Digestion
Ans: (c)
Q. Fats are:
(a) Proteins
(b) Esters
(c) Acids
(d) Bases
Ans: (b)
Q. Vitamins are required in:
(a) Large amount
(b) Small amount
(c) No amount
(d) Infinite
Ans: (b)
Q. Lipids are:
(a) Water soluble
(b) Insoluble
(c) Gases
(d) Metals
Ans: (b)
Q. Denaturation affects:
(a) Structure
(b) Mass
(c) Volume
(d) Colour
Ans: (a)
Q. Assertion: Proteins are polymers of amino acids.
Reason: Amino acids are linked by peptide bonds.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (b)
Q. Assertion: Enzymes are catalysts.
Reason: They increase reaction rate.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (d)
Q. Assertion: DNA carries genetic information.
Reason: It stores sequence of bases.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (c)
Q. Assertion: Carbohydrates are energy sources.
Reason: They are easily oxidised.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (a)
Q. Assertion: Lipids are insoluble in water.
Reason: They are non-polar.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (b)
Q. Assertion: Denaturation destroys protein structure.
Reason: Weak bonds are broken.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (d)
Q. Assertion: RNA is involved in protein synthesis.
Reason: It carries genetic code to ribosomes.
(a) Both true, R correct explanation
(b) Both true, R not correct explanation
(c) A true, R false
(d) A false, R true
Ans: (c)
