Cystic fibrosis is a genetic disease in which thick mucus accumulates over several types of epithelial cells, eventually blocking the pulmonary airways. The molecular basis of this disease is the production of a defective

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Cystic fibrosis is caused by a mutation in the cystic fibrosis transmembrane conductance regulator (CFTR) gene, leading to the production of a defective chloride channel. This results in mucus buildup in various organs, including the lungs. Therefore, the best choice is B.

Cystic Fibrosis Is a Genetic Disease in Which Thick Mucus