Final answer:
The genetic code is the sequence of nucleotide bases in DNA or RNA that specifies the sequence of amino acids in a protein. Each amino acid is encoded by a three-nucleotide sequence called a codon. There are 64 possible codons.
Step-by-step explanation:
The genetic code is the sequence of nucleotide bases in DNA or RNA that specifies the sequence of amino acids in a protein. Each amino acid is encoded by a three-nucleotide sequence called a codon. There are four possible bases in RNA: adenine (A), cytosine (C), guanine (G), and uracil (U). Each nucleotide can have one of these four bases, so each position in a codon has four possible choices. Therefore, there are 4 x 4 x 4 = 64 possible codons.