Question

Why is a cap added to MRNA, but not to 1RNA or RRNA? Each of the three types of RNA are transcribed by different RNA polymerases. Only RNA polymerase II, involved in mRNA synthesis, contains a domain capable of interacting with enzymes that form the cap. Transcription and processing of MRNA occur in the nucleus, where cap binding proteins are found. These proteins, which add and modify the cap, are not found in the cytoplasm, where tRNA and rRNA are transcribed and processed. Neither tRNA nor FRNA contain introns. Capping occurs simultaneously with intron removal because the same enzymes and proteins involved in both of these processes must bind to RNA at the same time. The double stranded regions on TRNA and mRNA result in complex folding and a three- dimensional shape of each molecule. The structure of tRNA and rRNA makes the 5' end of the molecule inaccessible to the enzymes that add the cap.

Please explain

Answer 1

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