Describe in short about $RNA.$
Ribonucleic Acid ($RNA$) was the first genetic material to be discovered.
It is evident through various scientific researches that essential life processes such as metabolism, translation and splicing etc. evolved around $RNA.$
$RNA$ used to act as a genetic material as well as a catalyst.
But $RNA$ being a catalyst was reactive and hence unstable.
Therefore $DNA$ has evolved from $RNA$ with chemical modifications that make it more stable.
$DNA$ being double stranded and having complementary strand further resists changes by evolving a process of repair.
The nitrogenous base in $RNA$ are of two types :$(i)$ Purines (adenine and guanine)
$(ii)$ Pyrimidines (Cytosine and Uracil) Ribose sugar + Nitrogenous base $\rightarrow$ Ribonucleoside
Ribonucleoside $+$ phosphate group $\rightarrow$ Ribonucleotide.
Identify the incorrect statement about $RNA.$
Replication was allowed to take place in the presence of radioactive deoxynucleotides precursors in $\rm {E. coli}$ that was a mutant for $\rm {DNA}$ ligase. Newly synthesised radioactive $\rm {DNA}$ was purified and strands were separated by denaturation. These were centrifuged using density gradient centrifugation. Which of the following would be a correct result
Write short note on $RNA$ World.
$A$ : Catalytic functions were assigned to $RNA$ molecule during evolution.
$R$ : The rate of mutation is quite fast in $RNA$