Question

In: Biology

The genome of an organism was analyzed and provided the following: 17%A, 23%G, 32%C, 0%T, and...

The genome of an organism was analyzed and provided the following: 17%A, 23%G, 32%C, 0%T, and 28%U. This organism is likely:

A virus

A virus or a bacterium

A bacterium

A bacterium or a eukaryote

A eukaryote

It cannot be calculated based on that number alone

Solutions

Expert Solution

  • The bases of both RNA or DNA forms hydrogen bonds creating “base pairs”.
  • According to Erwin Chargaff, these base pairing follows certain rules, designated as Chargaff rule
  • The Purine base of a nucleotide, will bond with pyrimidine of the other nucleotide. . Thus making the purine content of a nucleic acid equivalent to pyrimidine content.

In DNA, base pairing between two complementary strands takes place as:

  • Adenine is attached to Thymine by two hydrogen bonds (A=T).
  • Guanine is attached to Cytosine by three hydrogen bonds (G=C).

RNA may form base pairing, during its folding or forming hybrid with DNA.

  • Where the Adenine pairs to uracil (A=U) by two hydrogen bonds.
  • The base pairing results in formation of secondary structure of nucleic acids.
  • In case of single stranded RNA, Chargaff rule is not followed.
  • As in the given scenario, the genome does not contain Uracil.
  • Also purine content is not equivalent to pyrimidine content.
  • Thus, the genome is not DNA, and does not belong to an eukaryotic organism or bacteria.
  • Thus, this indicate the genome to belong to virus.

Answer: A virus


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