Answer:
Transfer RNA
Explanation:
An tRNA charged with an given amino acid, whose anti-codon matches the codon in the messenger RNA associated to the ribosome, is placed in that location being added to the polypeptide. After that, the complex Ribosome-mRNA moves along, another codon is exposed to receive other amino acid, and in the meanwhile the previous tRNA is excised from its amino acid, and leaves the complex
