The nuclear envelope disappears during ........... .

In which phase do new nuclei come into existence?

In which of the following phases does the formation of spindle fibers around the centrosome occur?

Describe the changes observed during the synthesis phase ($S$-phase).

Label the diagram and also determine the stage at which this structure is visible.

The energy required to pull each daughter chromosome towards opposite poles at a rate of $1 \mu m/min$ during anaphase is... (in $, ATP$)