Pre-mRNA

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Pre-mRNA is a single stranded RNA which has been transcribed from DNA in the nucleus, it still contains introns so is the same length as the DNA it was transcribed from. Unlike DNA the pre-mRNA contains uracil bases instead of Thyamine. This pre-mRNA will later be spliced by enzymes which remove any non coding sections of RNA known as introns creating a new mature, shorter strand of RNA.

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