That statement is incorrect. The genetic code is designed so that all 20 standard amino acids are specified by at least one codon.

Here's why:

* Redundancy: The genetic code has redundancy, meaning multiple codons can code for the same amino acid. This helps protect against mutations.

* Start and Stop: There are also specific codons for starting and stopping protein synthesis.

Therefore, every amino acid needed for protein synthesis is encoded by at least one codon in the genetic code.