Which organelle is known as the control center of the cell?

$S -$ Assertion: Individual chromosomes are not identifiable during interphase.
$R -$ Reason: They exist as highly extended and elaborate nucleoprotein fibers called chromatin.

What is the function of nuclear pores?

In a $SAT$ chromosome,the $SAT$ (satellite) is the terminal part of the chromosome beyond the secondary constriction,which contains:

Ribosomal $RNA$ is actively synthesized in the .......... .

What is the feature of a metacentric chromosome?