Feulgen showed that $DNA$ is present in . . . . . . .

What is the disc-shaped structure present on the centromere of each chromosome called?

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.

The structure of the nucleus does not include which of the following?

The structure of the nuclear membrane facilitates:

The number of large,metacentric chromosomes in humans is: