The document describes the process of protein synthesis, which involves two main steps: transcription and translation. In transcription, RNA polymerase copies DNA into messenger RNA (mRNA) in the cell nucleus. The mRNA is then transported out of the nucleus through nuclear pores. In translation, ribosomes in the cytoplasm read the mRNA and assemble amino acids in the sequence specified by the mRNA to produce a protein. tRNA molecules match their anticodons to the mRNA codons and deliver the corresponding amino acids.