Class 11 Biology - KERALA
Biomolecules
The chapter 'Biomolecules' in Class 11 Biology under the Kerala SCERT syllabus explores the chemical building blocks of living organisms. It delves into the structural and functional aspects of chemical compounds found in living tissues, such as carbohydrates, proteins, lipids, nucleic acids, and enzymes. Understanding these molecules is crucial because they form the basis of all metabolic processes, cellular structures, and genetic information transmission. For the Kerala Board exams, this chapter carries significant weight, frequently featuring questions on protein structures, enzyme action, and the difference between reducing and non-reducing sugars, making it a high-scoring area with both direct and application-based questions.
Start Learning FreeKey Concepts
Primary and Secondary Metabolites
Primary metabolites like amino acids and sugars have identifiable functions in physiological processes, while secondary metabolites like alkaloids and flavonoids are products of plant metabolic processes with ecological importance.
Proteins and Amino Acids
Proteins are heteropolymers of amino acids linked by peptide bonds, existing in primary, secondary, tertiary, and quaternary structural levels that determine their biological specificity.
Polysaccharides
Long chains of sugars acting as energy storage (starch, glycogen) or structural components (cellulose, chitin) in plants, animals, and fungi.
Nucleic Acids
DNA and RNA are polynucleotides composed of a nitrogenous base, a pentose sugar, and a phosphate group, responsible for heredity and protein synthesis.
Enzymes
Most enzymes are proteins that act as biological catalysts by lowering activation energy, influenced by temperature, pH, and substrate concentration.
Important Formulas
Board Exam Info
In the Kerala (SCERT) Class 11 Biology board examinations, the Biomolecules chapter typically carries around 6 to 8 marks. Questions often include short notes on protein structures, differences between DNA and RNA, factors affecting enzyme activity, and identification of functional groups in biomolecules.
Frequently Asked Questions
What is the difference between reducing and non-reducing sugars?
Reducing sugars have free aldehyde or ketone groups that can reduce oxidizing agents like Benedict's reagent (e.g., glucose, fructose). Non-reducing sugars do not have free reactive groups because their anomeric carbons are involved in glycosidic bonds (e.g., sucrose).
Why are lipids not strictly considered macromolecules?
Lipids have a molecular weight generally below 800 Daltons, which falls under the acid-soluble pool, whereas macromolecules have molecular weights exceeding 10,000 Daltons. However, they form part of cell membrane structures.
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 the reaction rate, which can be overcome by increasing substrate concentration.
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