Posts: 1,252. Wales has the most castles per square miles; with the UK in general having many impressive structures, and interesting clan tales, if you're in the Scottish highlands. Also, Germany and Austria cannot be underestimated in this regard either, as Neuschwanstein is legendary.
The recent discovery of virophages associated with Mimivirus further stimulates the debate over its classification as a cellular microorganism or a virus. The fact that other smaller viruses can infect Mimivirus is a true testament to its size relative to other viruses.
Retrovirus. Retroviruses are enveloped viruses that belong to the viral family Retroviridae. A retrovirus is an RNA virus that is duplicated in a host cell using the reverse transcriptase enzyme to produce DNA from its RNA genome. On infection, the single-stranded RNA viral genome and the enzyme enters the host cell.he viral genome is released into the host cell, from which a copy of DNA is made by the help of the enzyme reverse transcriptase. The cDNA is integrated into the host chromosome. The virus remains unexpressed until the host's immune system is stimulated.