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    Question

    If the base sequence of a codon in mRNA is

    5’-AUG-3’, the sequence of mRNA pairing with it must be
    A 5’-UAC-3’ Correct Answer Incorrect Answer
    B 5’-CAU-3’ Correct Answer Incorrect Answer
    C 5’-AUG-3’ Correct Answer Incorrect Answer
    D 5’-GUA-3’ Correct Answer Incorrect Answer

    Solution

    The first base of the anticodon in 5'-3' direction binds with the third base in codon (reading in 5'-3' direction). Thus, if the base sequence in codon of mRNA is 5'-AUG-3', the complementary anticodon will be 3'-UAC-5' or 5'-CAU-3'.

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