Scientists isolate cells in various phases of the cell cycle. They isolate a group of cells that have 1½ times more DNA than G1 phase cells. What is the most likely part of the cell cycle from which these cells were isolated?
A) between the G1 and S phases in the cell cycle
B) in the G2 phase of the cell cycle
C) in the M phase of the cell cycle
D) in the S phase of the cell cycle

Question

Quizplus · Accepted Answer

Cells in the S phase have duplicated their DNA, resulting in double the amount of DNA as G1 phase cells. Therefore, cells with 1½ times more DNA than G1 phase cells are likely in the middle of the S phase, just before the completion of DNA replication.

Scientists Isolate Cells in Various Phases of the Cell Cycle