Which scientist discovered the nucleus?

The centromere may also be called as:

The terminal end of a chromosome is called

The given diagram shows a chromosome. Which of the following data refers correctly to the chromosome?
No. of Centromere - No. of Kinetochore - No. of Arms

Balbiani discovered a special type of chromosome in the salivary gland of $Chironomus$ larvae,which are recognized by the presence of:

In a cell that is not dividing,the chromosomes are visible as a tangle of fine threads called