Normal cell division in the body depends on a precisely regulated set of events that determine when a cell will divide. two specific genes, proto-oncogenes and tumor-suppressor genes, are responsible for cell cycle regulation. when mutated, proto-oncogenes can become what scientists call ___________, stimulating excessive cell division.
a.cytogenes
b.oncogenes
c.tumor genes
d.anti-suppressor genes

B. Oncogenes. Protooncogenes usually mutate to form oncogenes, which codes for a growth factor that is permanently activated, which leads to excessive cell division.

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agis agis · Answer 2 · 2019-05-14T07:42:32+02:00

Answer:

(b). oncogenes.

Explanation:

Proto-oncogenes are normal cellular genes, associated with cell proliferation, growth and cell survival by inhibiting apoptosis. Proto-oncogenes become oncogenes and lead to excessive cell division.

These genes are called as cancer causing genes as these genes stimulate excessive cell growth and division and help in tumor formation.

Thus, the correct answer is option (b).