MCAT Biology Question 84: Answer and Explanation
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Question: 84
9. Studies have indicated that premature babies are often deficient in lysozyme. What is a possible consequence of this deficiency?
- A. Respiratory distress and alveolar collapse shortly after birth
- B. Increased susceptibility to certain infections
- C. Inability to humidify air as it passes through the nasal cavity
- D. Slowing of the respiratory rate in response to acidemia
Correct Answer: B
Explanation:
Lysozyme is an enzyme present in the nasal cavity, saliva, and tears that degrades peptidoglycan, preventing infection by gram-positive organisms. Thus, premature infants who lack lysozyme are more likely to suffer from infections with these organisms.