All of our cells contain protooncogenes that may turn into oncogenes, which are cancer genes. The best explanation for protooncogenes is that they

Question:All of our cells contain protooncogenes that may turn into oncogenes, which are cancer genes. The best explanation for protooncogenes is that they

1.came into our cells from a viral infection of our ancestors

2.arose from plasmids that have been inserted into bacteria and now reside in us

3.are DNA junk with no known function

4.help regulate cell division


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