The mutation for Wilson's disease is located in the short 5' UTR region of the ATP7B gene. Another associated gene (X) was discovered on the opposite non-coding strand of the ATP7B gene. The translation start codon of the ATP7B gene is located near the end of the first exon of gene X. The mutation in the ATP7B gene most likely will be complementary to which of the following?
  1. 3′ UTR of gene X
  2. 5’ UTR of gene X
  3. FirstexonofgeneX
  4. FirstintronofgeneX
  5. LastexonofgeneX
  6. Last intron of gene X

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