Class 12 Chemistry - ANDHRA-PRADESH
Biomolecules
The chapter Biomolecules in Class 12 Chemistry explores the chemical basis of life, focusing on complex organic molecules that form the foundation of living systems. Students study the classification, structure, and functions of carbohydrates, proteins, nucleic acids, vitamins, and lipids. Special emphasis is given to glucose structures, peptide bonds in proteins, the difference between DNA and RNA, and enzyme action. This is a high-scoring, theory-heavy chapter essential for both the Andhra Pradesh (BSEAP) board examinations and competitive medical entrance tests like NEET, requiring clear understanding of molecular structures and hydrolysis products.
Start Learning FreeKey Concepts
Carbohydrates
Optically active polyhydroxy aldehydes or ketones, classified as monosaccharides, oligosaccharides, and polysaccharides based on their hydrolysis behavior.
Proteins
High molecular mass polymers of alpha-amino acids linked together by peptide bonds, possessing primary, secondary, tertiary, and quaternary structural levels.
Nucleic Acids
Biopolymers such as DNA and RNA composed of nucleotides, responsible for the storage and transmission of genetic information from generation to generation.
Vitamins
Organic compounds required in small amounts for normal health, growth, and development, classified into fat-soluble (A, D, E, K) and water-soluble (B-complex, C) categories.
Enzymes
Biological catalysts produced by living cells, which are generally globular proteins that speed up specific biochemical reactions with high efficiency.
Important Formulas
Board Exam Info
In the Andhra Pradesh (BSEAP) Class 12 Chemistry board examinations, Biomolecules typically carries around 4 to 6 marks. Questions usually include very short answer questions (VSAQs of 2 marks) and short answer questions (SAQs of 4 marks). Frequently asked topics include the difference between DNA and RNA, classification of carbohydrates, zwitter ion form of amino acids, and vitamin deficiency diseases.
Frequently Asked Questions
Reducing sugars contain free aldehydic or ketonic groups and reduce Fehling's solution and Tollen's reagent (e.g., glucose, fructose). Non-reducing sugars have their carbonyl groups involved in glycosidic bond formation and do not reduce these reagents (e.g., sucrose).
Why are vitamin C and B-complex vitamins not stored in our bodies?
Vitamins C and B-complex are water-soluble, meaning they dissolve easily in water and are regularly excreted through urine from the body. Therefore, they must be supplied regularly through diet.
What is denaturation of proteins?
Denaturation is the process where native proteins lose their biological activity due to physical changes like temperature or chemical changes like pH alteration, which disrupts hydrogen bonds and uncoils the protein helix (e.g., coagulation of egg white on boiling).
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