Answer :

Because they may interact with one another, have quick generation times, typically small genome sizes, and have superficial chromosomal architecture, viruses and bacteria were used in many early DNA investigations.

A virus is a pathogenic microbe made of a protein-coated nucleic acid segment (either DNA or RNA). A virus cannot replicate itself freely; instead, it must infect cells and use the components of the host cell to do it.

Bacteria are common, typically free-living organisms made up of a single biological cell. They comprise a sizable prokaryotic bacterial group.

As a result, we can infer that many of the earliest DNA studies were conducted on viruses and bacteria because these organisms have quick generation rates, small genomes, a simpler chromosome structure, and the ability to interact with one another.

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