In some chromosomes,non-staining secondary constrictions at a constant location are known as:

Which of the following statements is/are correct?
$(a)$ The nuclear matrix or nucleoplasm contains the nucleolus and chromatin.
$(b)$ The outer nuclear membrane $(Ectokaryotheca)$ is usually continuous with the endoplasmic reticulum and also bears ribosomes on it.
$(c)$ Cells that are actively synthesizing protein have small and fewer nucleoli.

Chromatin is $.......P......$ in nature,so it is stained with $......Q......$ type of stain.

Where are nucleoproteins synthesized?

The movement of substances through the nuclear pore is facilitated by $..........$.

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