The sequence of amino acids in a polypeptide chain corresponds to the sequence of nucleotides on mRNA. If the reading frame of mRNA for a human protein is 993 nucleotides including a stop codon, how many amino acids would be incorporated?
Correct answer: D. 330
- A. 331
- B. 993
- C. 93
- D. 330
Explanation
Each codon = 3 nucleotides → 993 ÷ 3 = 331 codons. One is a stop codon → 330 codons code for amino acids.
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