What happens to the nucleolus during telophase?

• A. It disappears
• B. It reappears within each new nucleus
• C. It duplicates
• D. It becomes part of the cell wall

Answer: (B)

In telophase, two new nuclei are forming and the cell is reassembling its nuclear structure. The nucleolus, which had disappeared earlier as chromosomes condensed, comes back inside each of the new nuclei. Its reappearance signals the restart of ribosomal RNA synthesis so the daughter cells can resume normal ribosome production. It isn’t duplicated or turned into part of the cell wall; those processes occur at other stages, with the cell wall forming during later cytokinesis.