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If you were looking for the beginning of a gene in a DNA sequence, you would look for the sequence that codes for the start codon, AUG. What is the DNA complement to the start codon? A. TAC B. ATG C. UAC D. AUG



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mlevans0926
I believe the answer to your question would be A. TAC and a simple way to understand sequence codes is A goes with T, U goes with A, And G goes with C.

Answer: The correct answer is A) TAC.

Start codon is the first codon (sequence of three nucleotides) in the mRNA (messenger RNA) transcript from where the process of protein synthesis (translation) is initiated.

m RNA is formed using a template of DNA that is complementary to it.

For Thymine (T) in the DNA template, Adenine (A) is added in the mRNA and for Adenine (A), Uracil (U) is added in the mRNA.

Similarly, for Guanine (G), Cytosine is added in the mRNA and vice versa.


Therefore, corresponding to AUG in the mRNA, TAC sequence is present in the DNA.

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