A segment of messenger RNA (mRNA) consists of exactly 545454 nucleotides. In the process of translation, three nucleotides (a codon) code for a codon-sequence group of one single amino acid, with the exception of the stop codon, which signals the end of translation but does not add an amino acid to the polypeptide chain. Assuming this mRNA segment contains exactly one start codon at the beginning and exactly one stop codon at the end, determine:
The total number of codons in this mRNA segment.
The final number of amino acids in the translated polypeptide chain.