1. The viral oncogenes that are found in acute RNA oncogenic viruses

A. are present in all retroviruses

B. are modifed cellular oncogenes

C. are of viral origin

D. All the above

2. DNA oncogenic viruses

A. contain oncogenes that originally evolved in the viruses.

B. contain oncogenes that originally evolved in eukaryotic cells.

C. contain oncogenes that originally evolved in bacteria

D. all the above.