Which one of the following correctly represents the manner of replication of $DNA$?

Statement-$I$: The split gene arrangements represent probably an ancient feature of the genome.
Statement-$II$: Introns or intervening sequences do not appear in mature or processed $\text{RNA}$.

Match the columns.

Column-$I$	Column-$II$
$(a)$ Splicing	$(1)$ Lac Operon
$(b)$ Okazaki fragments	$(2)$ Lagging strands
$(c)$ Jacob and Monod	$(3)$ Lactose
$(d)$ Inducer	$(4)$ Removal of introns

The given figure shows the structure of a nucleosome with its parts labelled as $A, B$ and $C$. Identify $A, B$ and $C$.

The eukaryotic genome differs from the prokaryotic genome because

Consider the following four statements $(a-d)$ and select the option which includes all the correct ones only $:-$
$(a)$ Transcription and translation can be coupled in bacteria.
$(b)$ The split gene arrangements represent the advanced feature of the genome.
$(c)$ The process of splicing represents the dominance of $\text{RNA-}$world.
$(d)$ The presence of introns in split gene is reminiscent of antiquity.