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Which Of The Following Statements Concerning Ribosomes Are True?
A. Several ribosomes are often attached to and translating the same mRNA.
B. Ribosomes join amino acids to form a polypeptide.
C. Ribosomes have a binding site for mRNA and three binding sites for tRNA molecules.
D. No protein synthesis within a cell would occur without ribosomes.
E. All of the above statements are true.