Biology CLEP Prep Practice Exam

A codon is a sequence of three bases on a messenger RNA (mRNA) that corresponds to a specific amino acid. This means that three bases make up a single codon, as each codon represents one amino acid. Therefore, choices A, B, and D are incorrect as they do not provide the necessary sequence of bases to form a complete codon. Choice C, with the correct answer of three bases, is the only option that accurately reflects the number of bases needed to make up a codon. Choosing any other option would result in an incomplete codon and an incorrect representation of the amino acid sequence.