Tumor suppressor genes are distinguished from proto-oncogenes due to the fact that tumor suppressor genes normally _____ while proto-oncogenes _____
1.act at either the G1/S or the G2/M control point to inhibit cell division / encode proteins that stimulate cell growth and division
2.turn on or increase the rate of cell division / mutate to form oncogenes
3.act at either the G1/S or the G2/M control point to inhibit cell division / are switched off when mutated
4.none of the choices
1
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