Although the family name of Belcher is a prominent one in English and American history, it is actually Old French in origin. The ancestor of the Belcher family came to England from France, as part of William the Conqueror's army that came to England in the Norman Conquest of 1066 A.D.
(Microbiology) any of several viruses whose genetic specification is encoded in RNA rather than DNA and that are able to reverse the normal flow of genetic information from DNA to RNA by transcribing RNA into DNA: many retroviruses are known to cause cancer in animals.
7. Retroviruses are viruses whose genetic material is RNA. HIV and the SARS (severe acute respiratory syndrome) virus are examples of retroviruses. These viruses inoculate their RNA into the host cell and, within that cell, viral RNA is reverse transcripted into DNA.. Retroviruses are viruses whose genetic material is RNA. HIV and the SARS (severe acute respiratory syndrome) virus are examples of retroviruses. These viruses inoculate their RNA into the host cell and, within that cell, viral RNA is reverse transcripted into DNA.