Final answer:
In a stretch of mRNA that contains 360 bases, there would be 120 codons.
Step-by-step explanation:
The mRNA is read in sets of three bases known as codons. Each codon codes for a single amino acid. In a stretch of mRNA that contains 360 bases, we can determine the number of codons by dividing the total number of bases by three. Therefore, in this case, there would be 120 codons.