CMC Medical CMC-Medical VELLORE Solved Paper-2008

  • question_answer
    Dr. Khorana and his collegues synthesized an RNA molecule with repeating sequence of UG n bases (UG UG UG UG UG UG). It produced a tetrapeptide with alternating sequence of cystein and valine. It proves that codons for cystein and valine is

    A)  UGU and GUU

    B)  UGU and GUG

    C)  UUG and GGU

    D)  GUG and UGU

    E)  GUU and UGU

    Correct Answer: B

    Solution :

                    Codon is a sequence of three adjacent nucleotides that codes for one amino acid. A triplet would code for a given amino acid as long as three bases are present in a particular sequence. In the given base sequence with repeating sequence of UG nucleotide bases, a tetra peptide is produced with alternating sequence of cystein and valine. So, it proves that UGU code for cystein and GUG code for valine amino acid and a tetrapeptide with cystein and valine as alternating amino acids is produced.


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