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5.2.2. DNA types

DNA types

The different types of DNA can be classified according to their structure (single-stranded or double-stranded), according to their shape (linear or circular) and according to the way they are packaged (associated with histones or not associated with histones).

  • According to its structure:
    • Single-stranded: made up of a single strand. Is found in:
      • Linear form: in parvoviruses.
      • Circular shape: in the ΦX174 virus.
    • Double stranded: made up of two strands.
  • According to its packaging

    DNA IN DIFFERENT TYPES OF CELL ORGANIZATION

    PROKARYOTES

    Double-stranded circular DNA bound to histone-like proteins. Form the nucleoid. It is similar to DNA in mitochondria and chloroplasts.

    EUCHARIOTS

    Linear, double-stranded, histone- linked DNA found within the nucleus with varying degrees of packaging, condensing into chromosomes as the cell is dividing.

    VIRUS

    DNA can be linear or circular and single-stranded or double-stranded. Also, some viruses can have RNA as hereditary material.