Biology help pleasee?

1) nitrogen bases 2) bases 3) RNA 4) ? 5) polypeptides [enzymes that regulate chemical reactions, and these chemical reactions influence the resulting characteristics of the cell] 6) transcription 7) RNA 8) mRNA 9) translation 10) ribosomes 11) codons 12) tRNA 13) A site 14) codon 15) 3 base codon segments 16) amino acids 17) amino acids 18) bases 19) mRNA 20) DNA