26. What are the three main
types of RNA? What is meant
by heterogeneous RNA?

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Messenger RNA,or mRNA,transfer
RNA, or ,and somal RNA, or
rRNA, are the three main types of RNA.

The newly formed RNA molecule, a
precursor of mRNA,is called
hetero RNA (hnRNA). The
heterogenous RNA bears portions called
introns and portions called exons. The
hnRNA is processed in many chemical
steps, are removed and mRNA is
created formed only of , the
biologically active nucleotide sequences.