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KVPY Sample Paper KVPY Stream-SX Model Paper-30

  • question_answer
    The coding ratio in all known organisms is three, i.e., three nucleotides specify one amino acid. If DNA were to exclusively consist of only A-T base pairs, what would the minimum coding ratio be assuming that there are only 20 amino acids to be encoded?

    A) Two     

    B) Three

    C) Four     

    D) Five

    Correct Answer: D

    Solution :

    Since there are only two nucleotides, a code of single nucleotides would only represent two amino acids, such that A, and T could be translated to encode amino acids. A doublet code could code for 4 amino acids\[(2\times 2)\], a triplet code could code for 8 amino acids \[(2\times 2\times 2)\] whereas a quadruplet code could code for 16 amino acids \[(2\times 2\times 2\times 2)\]. A quintuplet code could make a genetic code for 32 different combinations \[(2\times 2\times 2\times 2\times 2)\] and provide plenty of information in the DNA molecule to specify the placement of all 20 amino acids.


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