During translation in a eukaryotic cell, __________.

• A. ribosomes move into the nucleus
• B. tRNA carries amino acid molecules to the nucleus, where they are added to a growing polypeptide chain
• C. mRNA is synthesized by the bonding of free nucleotides to the bases on the template strand of DNA
• D. polypeptides are synthesized at ribosomes, according to instructions carried by mRNA