Class 11 Biology - TELANGANA
Biomolecules
The 'Biomolecules' chapter in Class 11 Biology explores the chemical and metabolic basis of life, focusing on the organic and inorganic compounds that make up living tissues. Students will learn about the structure, classification, and functions of carbohydrates, proteins, lipids, and nucleic acids, as well as the crucial role of enzymes in metabolic pathways. Mastery of this chapter is essential for Telangana State Board (TSBSE) examinations as it forms the foundational building block for advanced topics in physiology, genetics, and biochemistry, frequently appearing in both short and long-answer questions.
Start Learning FreeKey Concepts
Chemical Analysis of Living Tissues
Tissues are ground in trichloroacetic acid to separate acid-soluble (micromolecules) and acid-insoluble (macromolecules) fractions to study their chemical composition.
Carbohydrates
Polyhydroxy aldehydes or ketones functioning as primary energy sources, categorized as monosaccharides, oligosaccharides, and polysaccharides like starch and cellulose.
Proteins
Heteropolymers of amino acids linked by peptide bonds, essential for structural support, transport, and acting as biological catalysts.
Nucleic Acids
Polymers of nucleotides consisting of a nitrogenous base, pentose sugar, and phosphate group, responsible for storing and transferring genetic information (DNA and RNA).
Enzymes
Biocatalysts mostly made of proteins that lower activation energy to accelerate biochemical reactions, influenced by temperature, pH, and substrate concentration.
Important Formulas
Board Exam Info
In the Telangana (TSBSE) Class 11 Biology examinations, this chapter typically carries around 6 to 8 marks. Questions frequently include 2-mark very short answer questions (VSAQs) on enzyme action or specific biomolecules, 4-mark short answer questions (SAQs) on protein structures or polysaccharide types, and occasionally diagrams related to enzyme inhibition or nucleotide structure.
Frequently Asked Questions
What is the difference between micromolecules and macromolecules?
Micromolecules have a low molecular weight (below 1000 Da) and are found in the acid-soluble pool (e.g., amino acids, sugars), whereas macromolecules have high molecular weights and are found in the acid-insoluble fraction (e.g., proteins, nucleic acids).
Why are lipids grouped under acid-insoluble fraction despite having low molecular weight?
Lipids have molecular weights less than 800 Da, but when tissues are ground, cell membranes break down and form vesicles that are not soluble in the acid-soluble pool, hence they precipitate in the acid-insoluble fraction.
How do competitive inhibitors affect enzyme activity?
Competitive inhibitors closely resemble the substrate in molecular structure and bind to the active site of the enzyme, blocking the actual substrate from binding and reducing enzyme activity, which can be overcome by increasing substrate concentration.
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