A) protein-coding region
B) 3' untranslated region
C) 5' untranslated region
D) promoter
E) start and stop codons

A) Ribosomes typically contain about 80% of the total cellular RNA.
B) Ribosomal RNA is processed in both prokaryotes and eukaryotes.
C) In eukaryotes, genes for rRNA are usually present within tandem repeats.
D) Each ribosomal RNA component is encoded by a separate gene.
E) In eukaryotes, the rRNA transcripts are processed further by snoRNAs within the nucleus.

A) two
B) three
C) four
D) five
E) The number cannot be determined from the information provided.