Which cell structure is represented in the given figure?

Which component is absent in chromatin?

Chromosomes having equal or almost equal arms are called

What is a centromere? How does the position of the centromere form the basis of the classification of chromosomes? Support your answer with a diagram showing the position of the centromere on different types of chromosomes.

.......... is a site for active ribosomal $RNA$ synthesis.

The shape of the chromosome is determined by