Cystic fibrosis and genetic screening Quiz
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5 questions, one answer each
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1. Which statement about the CFTR protein is correct?
- A. It is an enzyme that digests mucus
- B. It is a receptor for sodium ions in red blood cells
- C. It is a chloride channel in epithelial cell surface membranes
- D. It is a carrier that transports glucose into epithelial cells
2. Two carriers of cystic fibrosis have a child. What is the probability that the child has CF?
- A. 1 in 4
- B. 1 in 2
- C. 1 in 3
- D. 3 in 4
3. Why do many men with CF have no sperm in their semen?
- A. Sperm are destroyed by the immune system in the testes
- B. The testes do not produce sperm
- C. The prostate gland makes too much semen
- D. The vas deferens is blocked or absent
4. In pre-implantation genetic diagnosis, when are cells removed for testing?
- A. Amniotic fluid is taken at 15 to 17 weeks
- B. One or two cells are taken from an IVF embryo at about the 8-cell stage
- C. Placental tissue is taken at 11 to 14 weeks
- D. A blood sample is taken from the newborn baby
5. Which is a disadvantage of chorionic villus sampling?
- A. It cannot detect the CFTR mutation
- B. It can only be carried out after the baby is born
- C. It carries a small risk of miscarriage
- D. It destroys the embryo