Experiments have demonstrated that the "words" of the genetic code (the units that specify amino acids) are

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The correct answer is C) three-nucleotide sequences. These three-nucleotide sequences are called codons, and each codon specifies one amino acid. This system allows for a total of 64 possible codons (4 nucleotides, taken three at a time), which is sufficient to specify the 20 standard amino acids used in proteins, as well as three "stop" codons that signal the end of a protein-coding sequence. This triplet code is used throughout the vast majority of the genetic code, though there are some exceptions and variations in certain organisms.

Experiments Have Demonstrated That the "Words" of the Genetic Code