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  • All cells arise from pre-existing cells. The growth of the cell is mainly based on the cell division. The stages through which the cell passes from one division to another division is referred as cell cycle.
  • All living organisms from the Amoeba to Man, or algae to big trees are composed of individual units called cells.
  • The cell is the basic unit of life and it is a physical entity.
  • Robert Hooke, first observed and named the biological units known as cells.
  • The cell has to be sufficiently large to accommodate a large number of organelles in it.
  • A multicellular organism with its various types of cells is considerably more efficient than a single-celled organism.
  • Ribosomes are non-membrane bound organellas found in all cells - both eukaryotic as well as prokaryotic.
  • Cell wall is the outermost layer in the plant cell.
  • Cell membrane is the outermost layer in the animal cell and is found just inside the cell wall in the plant cell.
  • Numerous nuclear pores are inserted in the nuclear envelope and facilitate and regulate the exchange of materials between the nucleus and the cytoplasm.
  • Cytoplasm contains and supports the cell organelles.
  • Endoplasmic reticulum classified into two types. They are rough endoplasmic reticulum (RER) and smooth endoplasmic reticulum (SER).
  • The mitochondria break down sugars and release the energy for use by the cell.
  • The chloroplasts use the sun's energy to make food for the plant through a process called photosynthesis.

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