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Which explains a difference between prokaryotic and eukaryotic gene reguation?

A)Prokaryotes process DNA in the nucleus, so genes do not need to be activated.
B)Eukaryotes express all genes, so gene expression does not need to be regulated.
C)Eukaryotes utilize operons, so they do not need to produce sections of mRNA.
D)Prokaryotes do not have mRNA, so they do not have processes to degrade mRNA.