单项选择题Which one of the following is incorrect for the biogenesis of eukaryotic ribosomes( )
A．25-50% of the pre-rRNA is degraded
B． Pre-rRNA binds to ribosomal protein
C． Pre-rRNA is cut to form three classes of rRNA
D．Pre-rRNA is methylated
E．The rRNA gene for the 40S subunit is transcribed separately
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