Early geneticists wondered how only four nucleotides can specify the sequence of 20 amino acids in proteins. They hypothesized t
hat there must be a code that linked the nucleotide sequence in a gene to the amino acid sequence in a protein. Each nucleotide code is called a codon. Today we know that there is a genetic code in which __________nucleotide(s) code(s) for each amino acid.
Early geneticists wondered how only four nucleotides can specify the sequence of 20 amino acids in proteins. They hypothesized that there must be a code that linked the nucleotide sequence in a gene to the amino acid sequence in a protein. Each nucleotide code is called a codon. Today we know that there is a genetic code in which __________nucleotide(s) code(s) for each amino acid.
3
4
1
2
Explanation:
3 is the answer. 43 or 64 is the number of possible 3-letter codes that can be formed.
more than one codon can codes for the same amino acid
