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JEE Advanced levelSingle correct optionDifficulty 3 of 3bm218

The template strand 3-prime TACGGATTCATT 5-prime is transcribed into mRNA. Read the mRNA from its 5-prime end in non-overlapping codons, with UAA, UAG and UGA as stop codons (no amino acid), starting from the first codon. The number of amino acids encoded is

  1. A4
  2. B2
  3. C12
  4. D3

Answer: D

mRNA is complementary and antiparallel: 5-prime AUGCCUAAGUAA 3-prime. Codons: AUG, CCU, AAG, UAA. The fourth codon is a stop, so 3 amino acids are encoded.
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