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Question 1 of 39
What is the primary genetic cause of Cystic Fibrosis (CF)?
A. A mutation causing an inability to reabsorb sodium in sweat glands.
B. Mutations in the CFTR gene encoding a defective chloride channel protein.
C. Defects in the ATP-gated channel responsible for ion transport.
D. A deletion on chromosome 7 leading to improper protein folding.