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

Describe in short about $RNA$.

Which scientist was awarded the Nobel Prize in $1959$ for the in vitro synthesis of polyribonucleotides?

$A$ ribozyme is ...

Given below are two statements:
Statement $I$: Catalytic RNAs are called ribozymes.
Statement $II$: $RNA$ can undergo mutations,replicate,and catalyse reactions.
In the light of the above statements,select the correct option given below:

How many main types of $RNA$ are there?