Cellular and Molecular Biology

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RNA: Synthesis and Processing


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

at its 5' end which is called 5' capping.

In eukaryotes, the capping enzyme complex is attached to the RNA


Mitochondrial and chloroplast mRNA

capped by a modified nucleotide as occurs with eukaryote mRNA.