Question

There are 64 codons and 20 amino acids. Which of the following is not true?


A. All amino acids are linked to a codon.

B. Each amino acid is specified by only one codon.

I think it`s B

Answer 1

There are 4 nitrogenous base that group together in a triplet to form a codon. 4 raised to power 3 is 64. There 64 combinations. 1 is start codon that codes for methionine . 3 are stop codons. So an amino acid can be coded by more than one codon. Its B.