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NEET2019BotanyCell - The Unit of LifeActual

Which of the following nucleic acids is present in an organism having 70 S ribosomes only?

Options

  1. ASingle-stranded DNA with protein coat
  2. BDouble-stranded circular naked DNA
  3. CDouble-stranded DNA enclosed in nuclear membrane
  4. DDouble-stranded circular DNA with histone proteins

Correct answer

B. Double-stranded circular naked DNA

Step-by-step solution

Double-stranded circular naked DNA type of nucleic acid is present in an organism having 70 ~S ribosomes. These are present in prokaryotic organisms or cells. All prokaryotic cells have a single double-stranded (double helix), circular DNA molecule for their genetic material. This DNA is attached to the inner cell membrane where the DNA replicating machinery is located. The DNA is "naked", it does not have proteins associated with it as eukaryotic DNA does.

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