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Question:

In S-phase of the cell cycle, what happens to the amount of DNA?

Amount of DNA doubles in each cell

Amount of DNA is reduced to half in each cell

Amount of DNA remains same in each cell

Chromosome number is increased

Solution:

The interphase is characterized by G1, S, and G2 phase. S phase marks the period during which the amount of DNA per cell doubles. DNA replication occurs in S phase. So, the correct answer is option A.