The dna of eukaryotic cells has many copies of genes that code for rrna molecules. suggest a hypothesis to explain why a cell needs so many copies of these genes

A DNA sequence that codes for ribosomal RNA (rRNA) is called ribosomal DNA. There is from 50 to 5,000 sets of rRNA genes in eukaryotic genome, since the rRNA is critical for making ribosome to carry out protein synthesis. rRNA has an active role in recognizing conserved portions of mRNAs and tRNAs, so it must be made in sufficient quantities to keep up with a cell's demands for proteins.

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a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.