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

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

gladiator answered 3 years ago

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