These problems are less common than other causes for heart failure, but it is important to monitor heart function in people who have: 1  Anemia â It is the job of the red blood cells to carry oxygen needed to maintain life in the body's cells.
From Wikipedia, the free encyclopedia. A retrovirus is any virus which copies itself as part of the cell's DNA by reverse transcribing its RNA. Since the cell cannot proofread the step in which RNA is converted back to DNA, errors often go unnoticed.This makes the exact sequence of a retrovirus's RNA change often.rom Wikipedia, the free encyclopedia. A retrovirus is any virus which copies itself as part of the cell's DNA by reverse transcribing its RNA. Since the cell cannot proofread the step in which RNA is converted back to DNA, errors often go unnoticed. This makes the exact sequence of a retrovirus's RNA change often.
An oncovirus is a virus that can cause cancer. This term originated from studies of acutely transforming retroviruses in the 1950â60s, often called oncornaviruses to denote their RNA virus origin. It now refers to any virus with a DNA or RNA genome causing cancer and is synonymous with tumor virus or cancer virus.. The vast majority of human and animal viruses do not cause cancer, probably because of longstanding co-evolution between the virus and its host.