Final answer:
The translated peptide from the given mRNA sequence 5'-AUGGGCUACCGA-3' would be three amino acids long, ending at the stop codon CGA. The peptide thus consists of methionine, glycine, and tyrosine. The correct option is c.
Step-by-step explanation:
The mRNA sequence 5'-AUGGGCUACCGA-3' would translate into a peptide that is three amino acids long. Translation begins at the start codon (AUG), which is also the codon for the amino acid methionine. The sequence then continues to the next two codons, GGC (glycine) and UAC (tyrosine), before reaching the stop codon (CGA), which does not code for any amino acid and thus ends the translation process.
Therefore, the correct answer to how long the peptide would be is Option C, 3 amino acids. This is because the stop codon is not translated into an amino acid, leaving us with a tripeptide.