Which Does Not Apply to the Post-Transcriptional Processing of Ribosomal

Multiple Choice

Which does not apply to the post-transcriptional processing of ribosomal RNA?

A) The subunits of rRNA are produced in equal amounts since they originate from the same transcript.
B) tRNA precursors are sometimes cleaved from the primary transcript of rRNA precursor.
C) A polyA tail is added to the 5' end of the 30S subunit.
D) After initial cleavage of the primary transcript,specific endonucleases trim nucleotides from the ends of rRNA molecules.