Translation occurs at the **ribosome**. The codon currently being read sits at the:

**During elongation:** incoming aminoacyl-tRNA enters the **A** site (matching its codon). The growing peptide chain on P-site tRNA is transferred to A-site amino acid, forming a peptide bond. Ribosome translocates so that the now-empty tRNA moves to E site (exit), and A becomes P for the next cycle.