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.
76 exam-style questions on AQA GCSE Biology 6.1 Reproduction, covering 6.1.1 Sexual and asexual reproduction, 6.1.2 Meiosis, 6.1.3 Advantages and disadvantages of sexual and asexual reproduction, 6.1.4 DNA and the genome, 6.1.5 DNA structure, 6.1.6 Genetic inheritance, 6.1.7 Inherited disorders, and 6.1.8 Sex determination. Each one has a worked solution and a mark scheme showing where the marks go.