Which of the following organisms has been used for genetic research?

Given below are two statements.
Statement $I$: Heterocatalytic function of $DNA$ includes transcription and translation.
Statement $II$: $A$ unique feature of $DNA$ molecule which helps in its semiconservative duplication is the complementary nature of two strands.
In the light of the above statements,choose the correct answer from the options given below.

Write a comparative note on the properties of $DNA$ and $RNA$.

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Exon	$(I)$ Non-coding sequence
$(b)$ Intron	$(II)$ Coding sequence
$(c)$ Genetic code	$(III)$ Nucleosome
$(d)$ $DNA$ packaging	$(IV)$ Nirenberg,Khorana and Matthaei

Segment of $DNA$ which is responsible for inheritance and expression of a particular character is known as

Genes that maintain their position on a chromosome are called....