Which of the following codons will bind the tRNA with the anticodon UUG?

A A C

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A A U

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C A A

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C A U

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Solution

The correct option is B $C A A$
The ribosome binds to the mRNA from the 5' end and moves to the 3'. So, the translation of the mRNA occurs in 5' to 3' direction. The codons on the mRNA are complementary to the anti-codons on the tRNA, such that the tRNA binds with mRNA in 3' to 5' direction. So, if anti-codon on tRNA is 3'-GUU-5', its codon on mRNA will be 5'-CAA-3'.
Hence, the correct answer is 'CAA'

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