Where is ribosomal $RNA$ actively synthesized?

$DNA$ genetic material occurs by itself in lower organisms and combined with proteins as nucleoproteins in higher organisms. The nucleoprotein is organized in higher forms to form

Polytene chromosomes were first observed by

Where are nucleoproteins synthesized?

Polytene chromosomes in salivary glands are formed by the pairing of:

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