How is DNA stored?

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  • How is DNA stored?
    • Eukaryotic Cells
      • linear DNA molecules - chromosomes
        • made up of 1 long molecule of DNA & associated proteins
        • found in the nucleus
      • DNA molecule really long - has to be wound up
        • wound around histones (protein)
          • help support DNA
          • then coiled up very tightly to make compact chromosome
      • mitochondria & chloroplasts have own DNA
        • similar to prokaryotic DNA
          • circular & shorter than DNA in nucleus
          • not associated to histone proteins
    • Prokaryotic Cells
      • carry DNA as chromosomes
      • DNA molecules short & circular
      • not wound around histones
        • condenses to fit into cell by supercoiling


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