Final answer:
Oncogenic viruses have the ability to cause cancer by interfering with the normal regulation of the host cell cycle. Their tumorigenicity does not rely on viral oncogenes, but rather on the disruption of normal cellular processes.
Step-by-step explanation:
Oncogenic viruses viruses follow the normal viral infection cycle, and their tumorigenicity does not rely on viral oncogenes. Their tumorigenicity does not rely on viral oncogenes, but rather on the disruption of normal cellular processes.
For example, human papillomavirus (HPV) is an oncogenic virus known to cause cervical cancer, while the hepatitis B virus can lead to liver cancer. These viruses disrupt the cell cycle and promote uncontrolled cellular proliferation, which can eventually result in the development of cancerous tumors.
It is important to note that while oncogenic viruses increase the risk of developing cancer, not all individuals infected with these viruses will develop the disease. Other factors, such as the individual's immune response and genetic predisposition, also play a role.