AS LEVEL- Biology- Basic components of living systems (Eukaryotic + prokaryotic cells)

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  • Basic components of living systems (Eukaryotic + prokaryotic cells)
    • Prokaryotic
      • DNA is circular
      • No nucleus- DNA is in cytoplasm
      • Few organelles + No membrane bound organelles
      • Flagella (when present) made out of a protein flagellin arranged in a helix
      • Small cells (less than 2?m)
      • Cell wall is made out of a polysaccharide
      • Small ribsomes (70s, 18nm)
      • eg. E.coli bacterium
    • Eukaryotic
      • Many organelles + Membrane bound organelles
      • Flagella (when present) made out of microtubule proteins arranged in a '9+2' formation
      • Large ribosomes (80s, 22nm)
      • eg. Human liver cell
      • Large cells (about 10-100um)
      • DNA is circular
      • Nucleus present- DNA is in nucleus
      • No cell wall (in animals), cellulose cell wall (in plants), chitin cell wall (in fungi)

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