Final answer:
The statement that a codon specifies more than one amino acid is false; each codon corresponds to a single amino acid (or serves as a stop signal), though some amino acids are encoded by multiple codons. The correct option is false.
Step-by-step explanation:
The statement that a codon is a group of three bases that can specify more than one amino acid is false. A codon is a sequence of three nucleotides on an mRNA molecule that corresponds to a single amino acid. In the genetic code, each codon typically specifies one and only one amino acid, with some amino acids being represented by more than one codon due to redundancy in the genetic code. However, each individual codon codes for a single amino acid or serves as a stop signal during protein synthesis.
The exception to this is the start codon (AUG), which not only signals the beginning of translation but also specifies the incorporation of the amino acid methionine. This can be seen as a dual function for a single codon. But generally, the genetic code is precise, with 61 of the 64 possible codons coding for amino acids and the remaining three serving as stop codons terminating protein synthesis.