Oncogenes A)prevent formation of cancer cells. B)block the ability of cyclins to stimulate cell division. C)stimulate apoptosis. D)often stimulate cyclin-dependent kinases that speed up the G₁ phase.

Question

Quizplus · Accepted Answer

Oncogenes are genes that, when mutated or overexpressed, can promote uncontrolled cell division and lead to cancer. Many oncogenes stimulate cyclin-dependent kinases, which are enzymes that control the progression of the cell cycle. By activating these kinases, oncogenes can speed up the G1/S and G2/M transitions, promoting rapid cell division and potentially leading to the formation of cancer cells. Therefore, option D is the best choice as it states that oncogenes often stimulate cyclin-dependent kinases that speed up the G1/S and G2/M phases.