The cell is the basic structural and functional unit of life. All living organisms, from the smallest bacteria to complex multicellular organisms like humans, are made up of cells. Cells can exist as independent units of life (in unicellular organisms) or as building blocks of more complex structures (in multicellular organisms).
Cell wall : Non living, rigid structure Outer covering in plant, fungi and bacteria Functions : Provide shape to cell Protection from mechanical damage and infection Barrier to undesirable macromolecules Cell to cell interaction.
Nucleus - Robert Brown : Discovery of nucleus
Biomolecules are classified into 4 major types:
Carbohydrates (Sugars)
Proteins
Nucleic Acids
Factors Affecting Enzyme Activity
Meiosis – Cell Division in Sex Cells (Gametes)
Meiosis Happens in Two Parts
Meiosis I – Reduction division (chromosome number is halved)
Meiosis II – Like mitosis, but with haploid cells
(Session 2025 - 26)