The discease in which transmembrane carrier for the chloride ion is not produced is__________?
Correct answer: B. Cystic fibrosis
- A. Hyperchloesterolemia
- B. Cystic fibrosis
- C. Severe combined immunodeficiency syndrome
- D. AIDS
Explanation
Cystic fibrosis results from mutations in the CFTR gene, which normally produces a transmembrane chloride channel. Defective chloride transport disturbs salt and water movement across epithelial surfaces, producing thick mucus. Students may choose AIDS because it is also a serious disease, but AIDS is caused by HIV attacking immune cells, not by loss of a chloride channel.
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