Class 11 Chapter 9: Biomolecules
The Biomolecules chapter explains the chemical composition of living organisms and the structure, properties, and functions of biological macromolecules. It covers the major classes of biomolecules, including carbohydrates, proteins, lipids, nucleic acids, enzymes, vitamins, and metabolites, along with their biological significance. This chapter provides the biochemical foundation for understanding metabolism, genetics, and physiology, making it one of the most important chapters in NEET Biology. Many questions are directly based on NCERT tables, biomolecule structures, enzyme properties, and biochemical terminology.
At ALLEN, these revision notes simplify Biomolecules through concise explanations, NCERT-based facts, labelled diagrams, comparison tables, and exam-oriented revision points. These notes help students build conceptual clarity and prepare effectively for NEET and CBSE Board examinations.
1.0Chapter Snapshot
2.0Related Supporting Study Resources
3.0Learning Outcomes
After completing this chapter, you will be able to:
- Understand the composition and classification of biomolecules.
- Differentiate between carbohydrates, proteins, lipids, and nucleic acids.
- Explain the structure and functions of enzymes.
- Understand the role of biomolecules in metabolism.
- Compare different biological macromolecules based on their properties.
- Interpret biochemical structures and NCERT diagrams.
- Solve NCERT and NEET-based conceptual and application-based questions confidently.
4.05-Minute Quick Revision
Must-Revise Concepts
- Biomolecules
- Carbohydrates
- Proteins
- Lipids
- Nucleic Acids
- Amino Acids
- Monosaccharides
- Enzymes
- Vitamins
- Primary & Secondary Metabolites
- Peptide Bond
- Nucleotide
Important NCERT Facts
- Proteins are polymers of amino acids linked by peptide bonds.
- Starch is the storage carbohydrate in plants, while glycogen is the storage carbohydrate in animals.
- DNA stores genetic information, whereas RNA plays an important role in protein synthesis.
- Enzymes are biological catalysts that speed up biochemical reactions without being consumed.
- Lipids are generally water-insoluble but soluble in organic solvents.
- Enzyme activity is influenced by temperature, pH, substrate concentration, and inhibitors.
Diagram Recall
- Structure of Glucose
- Amino Acid Structure
- Peptide Bond Formation
- Protein Structure
- DNA Structure
- RNA Structure
- Nucleotide Structure
- Enzyme Action
- Lipid Structure
Quick Revision Tips
- Memorize the functions and examples of all biomolecules.
- Compare carbohydrates, proteins, lipids, and nucleic acids in a summary table.
- Revise enzyme properties and factors affecting enzyme activity.
- Practice labelled biochemical diagrams from NCERT.
- Focus on important biological terms and NCERT tables.
5.0High Weightage Topics
6.0NCERT Fact Box
7.0Common Mistakes & NEET Tips
8.0ALLEN Faculty Tips
- Prepare a comparison table for carbohydrates, proteins, lipids, and nucleic acids.
- Memorize important biomolecule examples directly from NCERT.
- Revise enzyme properties and enzyme action with diagrams.
- Learn biological functions before memorizing structures.
- Practice all NCERT biochemical diagrams regularly.
- Solve Previous Years' Questions (PYQs) and NCERT-based MCQs for better conceptual clarity.
9.0PYQ Trend Analysis
Biomolecules is one of the highest-weightage chapters in NEET Biology. Questions are frequently asked on proteins, enzymes, nucleic acids, carbohydrates, lipids, and biomolecule functions.
Note: The trend below is based on the analysis of previous years' NEET question papers. The exact number of questions may vary each year.
10.0Most Common Question Types
- Comparing carbohydrates, proteins, lipids, and nucleic acids.
- Identifying the functions of different biomolecules.
- Solving enzyme activity and enzyme inhibition-based questions.
- Explaining protein structure and peptide bond formation.
- Identifying the structure and role of DNA, RNA, and nucleotides.
- Solving biomolecule-based assertion-reason and match-the-following questions.
- Answering NCERT-based diagram and conceptual questions.
- Solving Previous Years' NEET questions from Biomolecules.
11.0Smart Revision Strategy
- Revise the classification of all biomolecules.
- Memorize important examples and biological functions from NCERT.
- Compare carbohydrates, proteins, lipids, and nucleic acids using summary tables.
- Practice enzyme-related concepts, factors affecting enzyme activity, and inhibition.
- Revise DNA, RNA, amino acid, and protein structure diagrams.
- Read all NCERT tables, examples, and highlighted facts carefully.
- Solve Previous Years' Questions (PYQs) and NCERT-based MCQs.
- Complete revision with a chapter-wise NEET mock test.