A 25-year-old male and his wife go to a fertility clinic for evaluation. His wife has no significant past medical history and is given a 'clean bill of health.' He has had bronchiectasis and a history of recurrent sinusitis, and was diagnosed with situs inversus as a child. He is found to be sterile. What is the most likely cause of his infertility?

  1. A)Abnormal levels of sphingomyelinase
  2. B)Hexosaminidase A deficiency
  3. C)Abnormal structure of ciliaGABARITO
  4. D)47, XXY karyotype
  5. E)Fibrillin deficiency

Explicação

The correct answer is B. Source: Kaplan USMLE Step 1 QBank — Biochemistry Test 2. Ver explicação completa e trilha adaptativa →

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