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JEE Main levelSingle correct optionDifficulty 2 of 3bm210

An mRNA coding region is exactly 306 nucleotides long, running in frame from the start codon AUG to the final stop codon UAA, both included. Assuming the start codon codes for an amino acid and the stop codon codes for none, the number of amino acids in the protein is

  1. A102
  2. B100
  3. C101
  4. D305

Answer: C

Codons = 306/3 = 102. The stop codon codes for no amino acid, so amino acids = 102 - 1 = 101.
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