How can a chromosome regulate transcription and decrease it? a: the region that codes for rna folds b: the region that codes for rna mutates c: the region that codes for rna unfolds d: the region that codes for rna has been removed

D: the region that codes for RNA has been removed

After the RNA is transcribed, it undergoes RNA splicing.  RNA splicing is a process that involves removal of introns, regions that often contain RNA transcript or non-coding regions, leaving only the exons, regions that code for protein, in a transcript.

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