Spindle fibers and kinetochores are two important structures for

During cell growth,where does $DNA$ synthesis occur?

During cell division,chromosomes attach to spindle fibers at which site?

During cell division,the nuclear envelope reforms at which stage?

If you are provided with a root tip of an onion in your class and asked to count the chromosomes,which of the following stages would be most suitable for observing the chromosomes?

$A$ cell spends less than $......\%$ of the total duration of the cell cycle in the $M$ phase.