SAT Subject Biology Practice Question 255: Answer and Explanation

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Question: 255

5. In which phase of the cell cycle does DNA replication take place?

A. G0
B. G1
C. G2
D. M
E. S

Correct Answer: E


In a eukaryotic cell, DNA is replicated in the S phase. The cell enters the G2 and M phases, having completed DNA replication. However, the cell is still diploid, as sister chromatids are still bound at the centromere.

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