Viruses may cause cancer in these three typical ways:
A. All viruses promote host cell proliferation, as a way to spread more virus.
B. Some viruses encode an oncogene in their genome.
C. When a DNA virus brings extra DNA into the host cell, that signals that S phase is complete.
D. Some viral proteins interact with cell cycle regulatory proteins.
E. Viral infection provides large amounts of nutrients, encouraging the cell to divide and proliferate.
F. Cell proliferation is an adaptive response of the host to any viral infection, to outgrow the virus.
G. A viral genome may integrate into the host chromosome, disrupting a cell cycle gene.
Answer: G
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