O Level Biology (5090) - Cells
Cells: The Building Blocks of Life 1.1 Cell Structure and Organization A cell is a a unit of life. It consists of a mass of living matter called protoplasm. Pr otoplasm Living matter of a cell. A complex jelly like substance. 70%-90% of water. Rest are dissolved organic compounds (carbohydrates,Proteins,etc) Composition varies from cell to cell and exact composition is unknown. It exists in Gell state (semi-solid) and Sol state (liquid) Protoplasm ↙ ↘ Cytoplasm Nucleoplasm Organelle A specialize part of a cell the is membrane bounded and that performs a specific function. For example: Mitochondria, Chloroplasts, Cell membrane, Ribosomes, etc. Structure of Cells 1. Cytoplasm: A part of protoplasm in between the cell membrane and nucleus envelop is called cytoplasm. It is the basic medium of the cell where all the cellular activities take place. All the cellular organelles a...