During the eukaryotic cell cycle, in which phase is DNA replicated?

• A. G1 phase of interphase
• B. S phase (synthesis phase) of interphase
• C. M phase (mitosis)
• D. G2 phase of interphase

Answer: (B)

Verified step by step guidance

1. Understand the phases of the eukaryotic cell cycle: G1 phase, S phase, G2 phase (all part of interphase), and M phase (mitosis).
2. Recall that during the G1 phase, the cell grows and performs normal functions but does not replicate DNA.
3. Identify that the S phase, or synthesis phase, is specifically when DNA replication occurs to prepare for cell division.
4. Note that the G2 phase involves further growth and preparation for mitosis, but no DNA replication happens here.
5. Recognize that the M phase is when mitosis and cytokinesis occur, dividing the cell into two daughter cells.