Class 12 Chemistry - UP
Biomolecules
The chapter Biomolecules in Chemistry for Class 12 Uttar Pradesh (UPMSP) students explores the chemical basis of life, focusing on complex organic molecules that build living systems. You will study the classification, structure, and functions of carbohydrates, proteins, vitamins, nucleic acids (DNA and RNA), and lipids. Understanding these molecules is crucial because they govern biological processes and frequently appear in UPMSP board exams as direct questions, structural differentiation problems, and conceptual queries about linkages and hydrolysis products, helping you secure high scores in organic chemistry.
Start Learning FreeKey Concepts
Carbohydrates
Optically active polyhydroxy aldehydes or ketones, classified as monosaccharides, oligosaccharides, and polysaccharides based on their hydrolysis behavior.
Proteins and Peptide Bond
High molecular mass polymers of alpha-amino acids linked together by peptide bonds (-CONH-), forming vital structural and functional components of cells.
Enzymes
Biocatalysts, mostly globular proteins, that speed up specific biochemical reactions in living organisms with high efficiency and specificity.
Nucleic Acids
Polymers of nucleotides consisting of a pentose sugar, a nitrogenous base, and a phosphate group, responsible for heredity and protein synthesis (DNA and RNA).
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).
Important Formulas
Board Exam Info
In the Uttar Pradesh (UPMSP) Class 12 Chemistry board exam, the Biomolecules chapter typically carries around 4 to 6 marks. Common question types include short-answer questions differentiating between DNA and RNA, defining peptide bonds or reducing sugars, and multiple-choice questions on vitamin deficiencies or glycosidic linkages.
Frequently Asked Questions
What is the difference between reducing and non-reducing sugars?
Reducing sugars contain free aldehydic or ketonic groups and can reduce Tollens' or Fehling's reagent (e.g., glucose, fructose). Non-reducing sugars have their carbonyl carbons involved in glycosidic bond formation and do not reduce these reagents (e.g., sucrose).
Why is cellulose not digested by human beings?
Humans lack the specific enzyme cellulase required to break the beta-glycosidic linkages present between glucose units in cellulose, whereas ruminants have bacteria that can digest it.
What is denaturation of proteins?
Denaturation is the process where native proteins lose their secondary and tertiary structures due to physical changes like temperature or chemical changes like pH, altering their biological activity without affecting the primary structure.
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