A researcher who detects a higher- than- normal amount of interferon in a laboratory rat would correctly conclude that

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Interferon is a protein that is produced by cells in response to viral infections. Its function is to interfere with viral replication in infected cells and to signal neighboring cells to prepare themselves for a viral attack. Therefore, detecting a higher-than-normal amount of interferon in a laboratory rat would indicate that the rat has, or recently had, a viral infection. Choices A, B, and D are not related to interferon production.

A Researcher Who Detects a Higher- Than- Normal Amount of Interferon