At which phase of the cell cycle do centrosomes begin to move apart in animal cells?

• A. Anaphase
• B. Metaphase
• C. Telophase
• D. Prophase

Answer: (D)

Verified step by step guidance

1. Understand the cell cycle phases: The cell cycle consists of interphase (G1, S, G2 phases) and the mitotic phase (mitosis and cytokinesis). Mitosis is further divided into prophase, metaphase, anaphase, and telophase.
2. Identify the role of centrosomes: Centrosomes are critical for organizing microtubules and are involved in forming the mitotic spindle, which is essential for chromosome separation during cell division.
3. Focus on prophase: During prophase, several key events occur, including the condensation of chromatin into visible chromosomes, the breakdown of the nuclear envelope, and the beginning of spindle formation.
4. Recognize centrosome movement: In prophase, centrosomes, which have duplicated during interphase, begin to move apart towards opposite poles of the cell, setting the stage for spindle formation.
5. Conclude with the correct phase: Based on the understanding of prophase, it is during this phase that centrosomes start to move apart, preparing the cell for the subsequent stages of mitosis.