Final answer:
The peptide translated from the mRNA sequence 5'-AUGGGCUACCGA-3' would be four amino acids long since it contains four codons, including the start codon AUG, which also codes for an amino acid.
Step-by-step explanation:
The student's question about the number of medals to be worn on a jacket does not relate to the detailed answer about a peptide translated from an mRNA sequence. However, concerning the translation of the mRNA sequence 5'-AUGGGCUACCGA-3', the length of the peptide can be determined by the number of codons present in the sequence.
Each codon codes for one amino acid, and the sequence presented contains four codons: AUG, GGC, UAC, and CGA. Since the start codon is AUG, translation would begin from this point. Counting the codons after AUG, there are three additional codons, making a total of four. However, the peptide length is determined by the number of amino acids, and because AUG is also a codon for an amino acid (methionine), the peptide would be four amino acids long.
Therefore, the correct answer to the question 'How long would the peptide be that is translated from this MRNA sequence: 5'-AUGGGCUACCGA-3'?' is d. 4.