The average life span of $mRNA$ in eukaryotes is:

The discovery of which of the following in $1980$ led to the term '$RNA$ World' for evolution?

$A$ - The process of splicing represents the dominance of $RNA$ world.
$R$ - The presence of introns is reminiscent of antiquity.

Ribose sugar is present in

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 $RNA$ is most abundant in an animal cell?