The most abundant type of $RNA$ in the cell is

Which of the following statements is false for $RNA$?
$(i)$ $RNA$ can directly code for the synthesis of proteins
$(ii)$ It is a very common process to synthesize $DNA$ from $RNA$
$(iii)$ $RNA$ is used as genetic material only in humans
$(iv)$ One polynucleotide chain is present in $RNA$

Which of the following biological molecules acts as a messenger?

According to the discovery made in the $1980$s,$RNA$ can act like an enzyme to assemble new $RNA$ molecules on an $RNA$ template. Which of the following statements is not supported by this theory?

What is the $3D$ structure of a transfer $RNA$ $(tRNA)$ molecule?

$A$ : Catalytic functions were assigned to $RNA$ molecule during evolution.
$R$ : The rate of mutation is quite fast in $RNA$.