In which of the following is the flow of genetic information in the reverse direction?

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

Distinguish between: $m-RNA$ and $t-RNA$.

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

Read the following statements and select the correct statements:
$(A)$ Essential life processes such as metabolism,translation and splicing are evolved around $\text{RNA.}$
$(B)$ Heavy isotope of nitrogen $(^{15}N)$ is a radioactive isotope,while light isotope of nitrogen $(^{14}N)$ is not a radioactive isotope.
$(C)$ The codon in $\text{rRNA}$ is read in a contiguous fashion.
$(D)$ In the first phase of translation,amino acids are activated in the presence of $\text{ATP.}$
$(E)$ $\text{DNA}$ from every tissue from an individual shows a high degree of polymorphism.
Choose the correct answer from the options given below:

Match the following columns correctly.

Column $I$	Column $II$
$(a)$ $m-RNA$	$(i)$ Found in ribosomes
$(b)$ $t-RNA$	$(ii)$ Carries information from $DNA$ to the cytoplasm for protein synthesis
$(c)$ $r-RNA$	$(iii)$ Contains $75$ nucleotides
$(d)$ $RNA$	$(iv)$ $A$ polynucleotide chain containing ribose sugar and uracil base,existing in three types