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Cell : The Unit of Life


  • It is the basic structural and functional unit of life.
  • Anton Von Leeuwenhoek saw and described a live cell.
  • Robert Brown discovered nucleus.
  • The name chromatin was given by Fleming.
  • Schleiden and Schwann formulated the cell theory.
  • Rudolf Virchow gave the concept Omnis cellula-e cellula i.e., all cells arise from pre-existing cells.
  • According to present day cell theory:
  • All living organisms are made up of cells.
  • All cells arise from pre-existing cells.
Prokaryotic cell
  • It includes bacteria, blue-green algae, mycoplasma, and PPLO.
  • Nuclear region is poorly defined. Nuclear material is naked.
  • They lack membrane-bound cell organelles such as plastids, mitochondrion, endoplasmic reticulum, etc.
  • Along with genomic DNA, they also have smaller circular DNA called plasmids.
  • Mesosome, a speciā€¦

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