USMLE-Rx Step 1 Practice Q's

USMLE-Rx Step 1 Qmax Challenge #1193

Check out today’s Step 1 Qmax Question Challenge.

Know the answer? Post it below! Don’t forget to check back for an update with the correct answer and explanation (we’ll post it in the comments section below).

usmle-rx-step-1-qmax-challenge-1193A 66-year-old woman with a history of cigarette smoking and extensive sun exposure is found to have a basal cell carcinoma. The cancer is excised, with clear margins, and genotyped so the the causative mutation may be identified. The mutation of interest is shown in the DNA-coding region and corresponding polypeptides shown below.

Which of the following diseases is caused by the same type of mutation as this patient’s mutation?

A. Cystic fibrosis
B. Duchenne muscular dystrophy
C. Huntington disease
D. Sickle cell disease
E. Williams syndrome


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