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Ribonucleic acid (RNA) synthesis involves special modifications during and after production of the precursor RNA.

Eukaryotic mRNA is modified at its five-prime (5') end shortly after transcription commences. This involves the addition of a modified
Select Option guaninecytosine
at its 5' end which is called 5' capping. In eukaryotes, the capping enzyme complex is attached to the RNA
Select Option polymerase Ipolymerase II
. Mitochondrial and chloroplast mRNA
Select Option isis not
capped by a modified nucleotide as occurs with eukaryote mRNA.
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