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DNA viruses are the lesser commonality of the two (RNA vrs. DNA) virus types. Typically, being the more complex of the two virus types, DNA are prone to affect animal life forms rather than the simpler plant life biology.
DNA viruses replicate by means of instructional sequences and activities located within the cell nucleus itself, rather than just outside, as do the simpler RNA viruses.
DNA viruses fall under three main categories. These are as follows: i) ssDNA viruses, ii) dsDNA viruses and iii) dsDNA-RT viruses, as illustrated and briefly exemplified below.
1) ssDNA viruses: The 'ss' in this case, stands for Single-Strand, referring to the fact that the virus in question maintains only one polymer strand of DNA. Chemically, this means that the polymer strand of the virus in question is not attached to a parallel partner strand, drastically changing the behavioural replication and chemical interaction patterns of the virus. Biologically speaking, DNA is typically a double stranded molecule, and it is rare, at best, for a life based organism to exist with only a single strand.
2) dsDNA viruses: the 'ds', in this case, stands (obviously) for Double-Strand, evidently referring to the fact that the virus contains a dual stranded polymer chain, whereby each base element connected to the polymer chain is in fact paired with another base element connected to a parallel polymer chain. A quick glance here will illustrate that this is in fact the most predominant form of DNA alignment among living organisms.
3) dsDNA-RT refers to the fact that the viral molecule in question is not only Double Stranded, but also 'Reverse Transcribing' as well. This points to the fact the the replicative process of the DNA strand of the virus is in fact physio-chemically 'backwards' from the traditional replicating method. Reverse transcribing viruses are, of course, less common than standard replicating viruses, but still just as deadly to another living organism in the traditional 'viral' sense.