Paragraf tamamlamaSoru #10789
The human immune system possesses an extraordinary capacity to remember past pathogens through memory B and T cells. ----. When exposed to the actual virulent virus months or years later, these primed defenses neutralize the threat before symptomatic infection can establish itself.
- A)Immunological defenses are completely incapable of recognizing foreign antigens after childhood
- B)Antibiotics are synthetic chemical compounds designed to destroy viral protein shells within hours
- C)Memory B cells are destroyed permanently whenever an individual catches a mild seasonal cold
- D)Vaccines exploit this immunological memory by introducing harmless antigens that stimulate antibody production without causing illness
- E)Viruses never mutate their surface proteins when spreading through human populations
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Doğru cevap: D) Vaccines exploit this immunological memory by introducing harmless antigens that stimulate antibody production without causing illness
Çözüm: Önceki cümle bağışıklık hafızasını, sonraki cümle ise virüsle karşılaşıldığında antikorların anında virüsü etkisiz kılmasını anlatır. D seçeneği aşıların bu mekanizmayı nasıl kullandığını açıklayarak boşluğu doldurur. Doğru cevap D'dir.