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Viruses are _______-coated fragments of DNA or RNA that have become detached from the genomes of cells and have the ability to replicate themselves within cells.

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A ____________ can contain DNA or RNA as its genetic material,but not both.

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One way in which retroviruses differ from all other types of viruses is that retroviruses


A) possess an RNA genome.
B) possess only single-stranded nucleic acids.
C) can create a prophage.
D) have single-strained RNA that serves as viral mRNA.
E) have the enzyme reverse transcriptasE.

F) B) and C)
G) A) and C)

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