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Class 9 Chemistry Chapter 10 Biomolecules MCQ with Answers – Complete Quiz Guide
Biomolecules are the chemistry of life itself—carbohydrates, proteins, lipids, and nucleic acids form the foundation of every living cell. Class 9 Chemistry Chapter 10 (NCERT 2024-25) explores these essential organic compounds and their roles in cellular function. This complete MCQ quiz guide helps you master biomolecules with concept clarity, real NCERT examples, and exam-ready practice questions. Whether you're preparing for your unit test or final board exam, these MCQs with detailed answers will strengthen your understanding and boost your confidence in biochemistry.
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What Are Biomolecules? NCERT Chapter 10 Overview
Biomolecules are organic compounds found in living organisms. NCERT Class 9 Chemistry Chapter 10 introduces four major categories: carbohydrates (energy and structure), proteins (enzymes and antibodies), lipids (energy storage and membranes), and nucleic acids (DNA and RNA for heredity). Each plays a vital role in life processes. Understanding their structure, properties, and functions is essential for CBSE exams and real-world biology comprehension.
Carbohydrates: Structure, Types, and Functions
Carbohydrates are composed of carbon, hydrogen, and oxygen in the ratio Cn(H2O)m. NCERT Chapter 10 classifies them into monosaccharides (glucose, fructose), disaccharides (sucrose, maltose), and polysaccharides (starch, cellulose, glycogen). They serve as primary energy sources and structural components. Glucose (C6H12O6) is the most important monosaccharide in cellular respiration. MCQs often test your knowledge of these classifications and their distinguishing features.
Proteins: Amino Acids and Peptide Bonds
Proteins are polymers of amino acids linked by peptide bonds. NCERT explains that 20 common amino acids combine in various sequences to create proteins with diverse functions—from enzymes catalyzing reactions to antibodies fighting infections. Chapter 10 emphasizes the difference between primary, secondary, and tertiary protein structures. Common exam questions ask about the peptide bond formation mechanism and the role of amino acids in protein diversity.
Lipids: Fats, Oils, and Biological Membranes
Lipids are hydrophobic or amphipathic molecules composed mainly of carbon and hydrogen with relatively little oxygen. NCERT Class 9 covers fats (triglycerides for energy storage), oils (liquid fats), and phospholipids (cell membrane components). Unlike carbohydrates and proteins, lipids do not form polymers. They provide more than twice the energy per gram as carbohydrates. MCQs test your understanding of lipid structure and their role in cellular function and energy metabolism.
Nucleic Acids: DNA, RNA, and Genetic Information
Nucleic acids are polymers of nucleotides, each containing a nitrogenous base, a pentose sugar, and a phosphate group. NCERT Chapter 10 distinguishes between DNA (deoxyribose sugar, double helix, permanent genetic storage) and RNA (ribose sugar, single strand, temporary information carrier). These molecules store and transmit genetic information essential for life. Exam questions often focus on the structure of nucleotides and the complementary base pairing in DNA.
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Common MCQ Patterns and Exam Strategies
CBSE Class 9 Chemistry exams frequently ask MCQs on biomolecule definitions, structural differences, functional roles, and real-world examples. Typical patterns include: identify the biomolecule type (definition-based), match properties to molecules, and explain why a molecule fits a category. Success requires clear understanding of each biomolecule's elemental composition, monomer units, and biological function. Practicing diverse MCQs builds pattern recognition and time management for board exams.
Carbohydrate MCQs: Key Questions and Answers
Sample MCQ: 'Which of the following is a monosaccharide?' Options: (a) Starch, (b) Glucose, (c) Sucrose, (d) Cellulose. Answer: (b). Explanation: Glucose is a single-unit sugar; others are polysaccharides or disaccharides. Another: 'The general formula for carbohydrates is?' Answer: Cn(H2O)m. NCERT Chapter 10 reinforces that monosaccharides are simple sugars, disaccharides have two units, and polysaccharides are long chains. Mastering these definitions ensures high MCQ scores.
Protein and Lipid MCQs: Structure and Function Questions
Key MCQ: 'What bond links amino acids in a protein chain?' Answer: Peptide bond. Explanation: Formed between the carboxyl group of one amino acid and the amino group of another, releasing water. Lipid MCQ: 'Which molecule is NOT a function of lipids?' (a) Energy storage, (b) Cell membrane structure, (c) Enzyme catalysis, (d) Insulation. Answer: (c)—that's a protein function. These questions test your grasp of biomolecule roles and structure-function relationships.
Nucleic Acid MCQs: DNA, RNA, and Base Pairing
Sample MCQ: 'In DNA, which base pairs with Adenine?' Answer: Thymine. Explanation: A–T and G–C are complementary base pairs in DNA double helix; RNA has Uracil instead of Thymine. Another: 'Which pentose sugar is found in RNA?' Answer: Ribose. NCERT Chapter 10 emphasizes these structural differences between DNA and RNA. Such MCQs assess your understanding of genetic material structure and the biochemical basis of heredity.
Frequently asked questions
What are the four main categories of biomolecules covered in NCERT Class 9 Chapter 10?+
The four main biomolecules are carbohydrates (energy and structure), proteins (enzymes and antibodies), lipids (energy storage and membranes), and nucleic acids (DNA and RNA for genetic information).
What is the difference between a peptide bond and a glycosidic bond?+
A peptide bond links amino acids in proteins; a glycosidic bond links monosaccharides in carbohydrates. Both are formed through condensation reactions releasing water.
How many amino acids are discussed in NCERT for protein formation?+
NCERT Class 9 Chapter 10 recognizes 20 common amino acids that combine in various sequences to form proteins with diverse structures and functions.
Is CBSETUTOR.ai's AI tutor service free to try?+
Yes, CBSETUTOR.ai offers a free trial so you can experience personalized MCQ practice, video explanations, and doubt-solving in Hindi and English before committing.
Does CBSETUTOR.ai provide support in Hindi medium for CBSE students?+
Absolutely. CBSETUTOR.ai supports both Hindi and English mediums with full NCERT alignment, making Chemistry, Biomolecules, and all CBSE topics accessible to every learner.
What is the main role of nucleic acids in living cells?+
Nucleic acids (DNA and RNA) store and transmit genetic information. DNA preserves hereditary traits; RNA carries instructions for protein synthesis. Both are essential for life processes.
Why do lipids provide more energy than carbohydrates?+
Lipids yield approximately 9 kcal/gram because they contain more carbon-hydrogen bonds (highly reduced form), while carbohydrates yield ~4 kcal/gram (partially oxidized).
How can I prepare effectively for Biomolecules MCQs using CBSETUTOR.ai?+
Use CBSETUTOR.ai's MCQ quiz mode, watch concept videos for each biomolecule type, practice with step-by-step answer explanations, and track your progress in real time for exam readiness.
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