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NEET 2019 Odisha · BiologyProkaryotePrevious Year Question

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

Answer: (B) Double stranded circular naked DNA. Answer: (B) Double stranded circular naked DNA Solution: An organism having only 70S ribosomes is a prokaryote, whose genetic material is a naked, double-stranded, circular DNA molecule not enveloped by a nuclear membrane and lacking histone packaging.

  1. A.Single stranded DNA with protein coat
  2. B.Double stranded circular naked DNA✓
  3. C.Double stranded DNA enclosed in nuclear membrane
  4. D.Double stranded circular DNA with histone proteins

Correct Answer

(B) Double stranded circular naked DNA

Solution & Explanation

Answer: (B) Double stranded circular naked DNA Solution: An organism having only 70S ribosomes is a prokaryote, whose genetic material is a naked, double-stranded, circular DNA molecule not enveloped by a nuclear membrane and lacking histone packaging. Options describing nuclear-membrane-enclosed DNA or DNA with histone proteins refer to eukaryotes (80S ribosomes), and single-stranded DNA with a protein coat describes a virus. Hence the prokaryote has double-stranded circular naked DNA. NCERT Reference: Ch 8, p.90, lines 6–9: "There is no well-defined nucleus. The genetic material is basically naked, not enveloped by a nuclear membrane. In addition to the genomic DNA (the single chromosome/circular DNA)"

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