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Precursor messenger RNA (mRNA) has to be converted into mature messenger RNA prior to protein translation.

This process is necessary in eukaryotes because precursor mRNA produced during transcription contains _______________ which must be removed prior to translation.

A

exons (coding sequences of RNA)

B

introns (coding sequences of RNA)

C

exons (noncoding sequences of RNA)

D

introns (noncoding sequences of RNA)

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