Cell Cycle
Which of the following begins when pairs of sister chromatids align in the center of the cell?

Anaphase
Interphase
Metaphase
Prophase

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Cell Cycle
The cell cycle is controlled in most cells by

time (after a certain length of time the cell divides)
different cells exhibit different control strategies
cell size (when the cell reaches a certain size, it divides)
a series of checkpoints

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