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Why is it likely that a single nucleotide substitution of uracil for thymine in a DNA strand's coding region will have little effect on the organism? I. Uracil and thymine nucleotides will both bind to adenosine II. The genetic code is duplicative III. Single nucleotide substitutions rarely have a significant impact IV. Because uracil is not normally found in DNA, the substitution is likely to be detected and repaired.
Correct Answer:
I and IV

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