[Campbell Biology P.1003] According to the text, which of the following statements about inna... | Practice Question
According to the text, which of the following statements about innate immunity is true?
A: Mammalian phagocytic cells recognize only bacterial components via Toll-like receptors.
B: Double-stranded RNA is a common product of normal mammalian cell replication and thus does not trigger an immune response.
C: The presence of double-stranded RNA (dsRNA) in an insect host cell can trigger a specific defense mechanism against invading viruses.
D: Innate immune defenses in jawed vertebrates completely replaced the more ancient adaptive immune system.
Explanation
The text explicitly states that in insects, when a virus replicates in the host cell, double-stranded RNA is formed. Because animals do not produce double-stranded RNA, its presence can trigger a specific defense.