8.5

• At the start codon (AUG), the ribosome attaches to the mRNA and translation begins, it codes for methionine.
• At the stop codon, the triplet bases that cause the ribosome, mRNA and tRNA molecule all separate and the polypeptide chain is complete.
• The DNA sequence of triplets determines the codon sequence on mRNA that determines that order that tRNA molecules line up determining the sequence of amino acids.
• In translation, ATP provides energy to attach amino acids to tRNA and to attach amino acids together.