Which of the following statements is incorrect in relation to the nucleolus?

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.

Chromosomes are composed of .......

Telocentric chromosome differs from acrocentric chromosome in that

$A$ repeated cycle of $DNA$ replication without separation of daughter chromatids leads to the formation of

The eukaryotic chromosomes are made up of