Class 11 Biology Chapter 4 New Notes – Biomolecules (2026 Updated)
written by Muneeb TariqThese class 11 biology chapter 4 notes cover Biomolecules according to the new syllabus. The biology class 11 chapter 4 notes include complete content on water properties (high specific heat, high heat of vaporization, solvent properties) and chemical bonds (covalent, ionic, hydrogen, van der Waals).
The notes provide detailed coverage of carbohydrates including monosaccharides (glucose, galactose), disaccharides (sucrose, maltose), and polysaccharides (starch, glycogen, cellulose, chitin). They also cover proteins with fibrous proteins (collagen, keratin) and globular proteins (enzymes, hemoglobin), sickle cell hemoglobin, and the importance of amino acid sequence in protein structure and function.
The chapter 4 biology class 11 notes include lipids, acylglycerols (fats and oils), phospholipids with amphipathic properties, waxes, and terpenes including chlorophyll. The notes contain nucleic acids (DNA as a double-stranded helix with A-T and G-C base pairs, RNA as single-stranded molecule), and conjugated molecules including glycoproteins (carbohydrate + protein), glycolipids (carbohydrate + lipid), lipoproteins (lipid + protein), and nucleoproteins (nucleic acid + protein).
These class 11th biology chapter 4 notes explain energy storage, structural functions, membrane formation, and genetic information storage to help students understand biochemistry and score better in exams.
Download Class 11 Biology Chapter 4 Notes PDF
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FAQs
Do these notes include solved examples and diagrams?
Yes, the Biology Notes for Class 11 Chapter 4 include solved examples, diagrams, and illustrations to help you understand concepts better and score well in exams.
What topics do these class 11 biology chapter 5 notes cover?
These notes cover enzyme active sites, cofactors (inorganic ions, prosthetic groups, coenzymes), enzyme action mechanisms (Induced Fit Model, Lock and Key Model), enzyme catalysis, energy of activation, temperature and pH effects, enzyme concentration, enzymatic inhibition, competitive and non-competitive inhibitors, feedback inhibition, and enzyme classification.
Are these biology class 11 chapter 5 notes updated for 2026?
Yes, these notes follow the current syllabus requirements for Enzymes.
Can I download these class 11 biology chapter 5 notes pdf for free?
Yes, the class 11 biology chapter 5 notes pdf download is available at no cost.
What enzyme models are explained in these notes?
The chapter 5 biology class 11 notes explain the Induced Fit Model and compare it with the Lock and Key Model of enzyme action.
Do these notes explain factors affecting enzyme activity?
Yes, these class 11th biology chapter 5 notes explain temperature effects (with human and thermophilic bacteria examples), pH effects (optimum pH for trypsin, pepsin, papain), and enzyme concentration effects on reaction rates.
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