Mitosis consists of nuclear division only

Steps:

• Define mitosis as the process of nuclear division in eukaryotic cells, excluding DNA replication and cytoplasmic division.
• Review events: assume 1 is DNA replication (interphase), 2 is chromosome segregation (anaphase), 3 is cytokinesis (cytoplasmic division).
• Match events to mitosis phases: prophase, metaphase, anaphase, telophase.
• Select option listing only mitotic events: 2 aligns with nuclear division.

Why D is correct:

• Mitosis specifically involves nuclear envelope breakdown, chromosome alignment, and segregation, matching event 2 per standard cell biology definitions.

Why the others are wrong:

• A includes 1 (DNA replication occurs in interphase, before mitosis) and 3 (cytokinesis follows mitosis).
• B includes 1 (pre-mitotic replication) but excludes 2 (core mitotic event).
• C includes 3 (cytokinesis is separate from nuclear division in mitosis).

Final answer: D