A) in their genome oncogene is present
B) their hereditary material made up of single stranded RNA
C) they have a gene for reverse transcriptase.
D) in their genome their may be cellular protooncogene
Correct Answer: D
Solution :
In humans retro virus is considered as a cause of cancer because in their genome cellular protooncogene is present. A proto-oncogene is normal gene that can become an oncogene due to the mutations or increased expression. The resultant protein encoded by an oncogene is known as oncoprotein.
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