Identify the incorrect statement about $RNA.$
$RNA$ was the first genetic material to evolve in the living systems.
Apart from being a genetic material, it is also a catalyst.
$DNA$ evolved from $RNA$ with chemical modifications.
$RNA$ being a catalyst is non-reactive and stable.
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 $RNA$
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
Describe in short about $RNA.$