Thread-like structures composed of nuclear $DNA$ in eukaryotic cells that carry genetic information are known as chromosomes. Who coined the term 'chromosome'?

$S -$ Statement: Based on the position of the centromere,chromosomes are classified into four types.
$R -$ Reason: Chromosomes contain a centromere,which is a primary constriction or disc-shaped structure.

The nucleus is separated from the surrounding cytoplasm by a nuclear membrane,which is

Which structure is active for transcription?

How many layers are present in the nuclear envelope?

Telocentric chromosome differs from acrocentric chromosome in that