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Lisa asked in Science & MathematicsBiology · 1 month ago

If the anticodon of a molecule of tRNA has the sequence CUA, what was the original DNA sequence ?

2 Answers

  • Robbie
    Lv 5
    1 month ago

    It would be the same as the original DNA sequence with the exception that instead of CUA, the original DNA triplet was CTA as there is no uracil in DNA only in RNA molecules.

    First the DNA sequence (CTA) was transcribed to produce complementary mRNA (remember the rule A bonds with U, T with A, G with C and C with G). RNA does not contain thymine. So from CTA we get GAU in our mRNA molecule. Now the anticodon on the tRNA (adapter, "molecule dictionary", "molecular Translator") will be complimentary to the mRNA codon, hence almost the same as the DNA sequence, but again since it is RNA there will not b thymine. So the anticodon sequence on the tRNA will be CUA.

  • 1 month ago

    Let's see, your tRNA anticodon is 5'-CUA-3' which means your mRNA codon was 3'-GAU-5' which means that your DNA template strand fragment was 5'-CTA-3' which means that your DNA sense strand was 3'-GAT-5'.  If we write the sense strand with the 5' end on the left, your original DNA was

    5'-TAG-3' (sense strand)

    3'-ATC-5' (antisense strand)

    If your teacher wants some other answer, then your teacher must mark the 5' and 3' ends of the given tRNA fragment.  Your teacher is stupid for not already having done that.  When you grow up and you're a biology teacher, ALWAYS mark the 5' and 3' ends, and you will be a better biology teacher than the git you have now.

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