Question

Viruses can cause cancer by all of the following except

A) by inserting a provirus
B) by carrying oncogenes as part of their genomes
C) by inhibiting tumor repression mechanisms in cells
D) by increasing the sensitivity of cells to other viruses
E) by increasing the activity of oncogens already present

Answer 1

Oncogenic viruses can cause cancer by introducing genes that stimulate unregulated cell growth, interfering with the expression of genes that inhibit cell growth, and increasing the activity of oncogenes already present in cells. So, the correct answer is option e.

Step-by-step explanation:

Oncogenic viruses, including some DNA and RNA viruses, have the ability to cause cancer by interfering with the normal regulation of the host cell cycle. They can do this by introducing genes that stimulate unregulated cell growth (oncogenes), interfering with the expression of genes that inhibit cell growth, and increasing the activity of oncogenes already present in cells. However, viruses do not cause cancer by inserting a provirus or increasing the sensitivity of cells to other viruses.

So, the correct answer is option e.