The small disc-shaped structures present on the surface of the centromere are called:

Nucleosome consists of

$A$ chromosome having the centromere in the middle is called .......

$S$ - Statement: $RNA$ and protein molecules move between the nucleoplasm and the cytoplasm.
$R$ - Reason: Nuclear pores are present at several locations in the nuclear envelope of the nucleus.

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

What can be observed in the interphase nucleus using a light microscope?