Question

All of our cells contain protooncogenes that may turn into oncogenes, which are cancer genes. Which statement best describes the protooncogenes?

• A. Came into our cells from a viral infection of our ancestors
• B. Arose from plasmids that have been inserted into bacteria and now reside in us
• C. Are DNA "junk" with no known function
• D. Turn into oncogenes as we age
• E. Help regulate cell division

Answer 1

Answer: (E)

Help regulate cell division

Any gene that encodes a protein capable of cell transformation in culture or induction of cancer in animals is referred to as an oncogene. The normal cellular gene from which it arises is called a protooncogene which constitutes one of the category of normal growth regulatory genes that promote cell division. Mutation in these genes alters the cell division signals at any of five steps leading to uncontrolled cell division. Thus, the correct answer is option E.