Tumor cells accelerate division by shortening interphase

Steps:

• Cell cycle consists of interphase (G1, S, G2) and M phase (mitosis + cytokinesis).
• Tumor formation requires rapid proliferation, shortening overall cycle time.
• Checkpoints in interphase regulate progression; cancer cells bypass these for faster cycling.
• Interphase, the longest phase, is primarily shortened to enable quick DNA replication and growth.

Why B is correct:

• Interphase is shortened in tumors as cells reduce G1 duration, allowing unchecked progression per the cell cycle control model.

Why the others are wrong:

• A: Cytokinesis divides cytoplasm post-mitosis and remains brief, unaffected by tumor acceleration.
• C: Mitosis duration stays similar or lengthens slightly in tumors due to error-prone division.
• D: Telophase, a mitosis subphase, is not specifically shortened in tumor cells.

Final answer: B