The DNA doubles and chromosomes replicate during which phase of the cell cycle?
A. $\mathrm{G} 1$
B. metaphase
C. $\mathrm{S}$
D. G2
Choose A, B, C or D as your solution.
The correct answer is C. The majority of the cell cycle is spent in interphase, which consists of three stages: G1, S, and G2. In the G1 stage of interphase, the cell organelles are doubled, and materials required for DNA synthesis are accumulated for the onset of cell division. The $\mathrm{S}$ stage of interphase is the stage of the cell cycle where the amount of DNA doubles with the replication of chromosomes. In the G2 stage of interphase, which follows the synthesis of DNA, proteins required for the next cell division are synthesized. Metaphase is the stage in mitosis characterized by the precise lineup of the chromosomes along the equatorial plane.