单选题
A eukaryotic cell has( )
A、
One copy of each ribosomal transcription unit.
B、
Thousands of copies of the 5S rRNA gene.
C、
Two copies of each gene for rRNA and ribosomal proteins.
D、
Two copies of each gene for rRNA and one copy of each ribosomal proteingene.
【正确答案】
B
【答案解析】
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