What must happen in order for a cell to move to S phase from G₁? A)It must divide. B)It must generate an external signal. C)It must receive a growth-promoting signal. D)It must divide and receive a growth-promoting signal. E)It must grow greatly.

Question

Quizplus · Accepted Answer

In order for a cell to move from G₁ to S phase, it must receive a growth-promoting signal that initiates DNA replication. This signal can come from external factors such as growth factors or interactions with neighboring cells, or it can come from internal factors such as the accumulation of certain proteins or changes in the levels of regulatory molecules. Therefore, choice C, "It must receive a growth-promoting signal," is the correct answer. Choices A, B, D, and E do not fully address the requirements for entering S phase.

What Must Happen in Order for a Cell to Move