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A ribosome is best described as
O a three-subunit enzyme that copies DNA to generate an mRNA sequence.
O an enzyme activity that properly pairs up amino acids with their corresponding tRNA.
O a complex built of two subunits made of about 50 separate proteins and 3 rRNAs.
O an inner core of nucleic acid covered by a protein coat containing surface spikes.
O an RNA molecule that binds to an initiation site on the mRNA.