During cell division,what is the structure called where spindle fibers attach to the chromosomes?

Centromere is required for

During cell growth,$DNA$ synthesis takes place on

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?

In mitosis,the nucleolus and nuclear membrane disappear at which stage?

Mitotic spindle initiates during