How are tumor cells different from normal cells?

In contrast to normal cells, cancer cells don’t stop growing and dividing, the uncontrolled cell growth results in the formation of a tumor.. the genetic changes that contribute to cancer usually affect three specific types of gene; proto-oncogenes, tumor suppressor genes, and DNA repair genes.

When a virus infects a host cell, it uses the cell's machinery to make copies of its own genetic material in a process called replication. finally, during the process of self-assembly, that protein shell and the copies of the virus's genetic material are assembled into new viruses.