There Are a Number of Small DNA Viruses That Are

question 3

Multiple Choice

There are a number of small DNA viruses that are highly dependent on their host cells for transcription and replication enzymes.Which of the following could explain the evolutionary origins of these viruses?

• A) They originated from fragments of the genomes of larger more independent viruses.
• B) They originated from intracellular plasmids found in bacteria.
• C) They originated from the genomes of intracellular organelles, such as mitochondria.
• D) They originated from fragments of cellular DNA that broke away from the cell genome.
• E) All of the above could be correct.

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