Interferons are an important part of the host defense against viral infections. What is interferon’s principal mode of action?
A: It is present in the serum of healthy individuals, providing a viral surveillance role.
B: It coats viral particles and blocks their attachment to cells.
C: It induces synthesis of one or more cellular proteins that inhibit translation or transcription.
D: It protects the virus-infected cell that produced it from cell death.
E: It directly inactivate the viruses.
A: It is present in the serum of healthy individuals, providing a viral surveillance role.
B: It coats viral particles and blocks their attachment to cells.
C: It induces synthesis of one or more cellular proteins that inhibit translation or transcription.
D: It protects the virus-infected cell that produced it from cell death.
E: It directly inactivate the viruses.
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- Interferons are a family of eukaryotic cell proteins classified according to the cell of origin. IFN-ɑ and IFN-β are produced by a variety of virus-infected cells. They A: act on target cells to inhibit viral replication B: act directly on the virus C: are virus-specific D: all of above
- An example of lysogeny in animals could be A: slow viral infections. B: latent viral infections. C: T-even bacteriophages D: Infections resulting in cell death
- Which one of the following is a fundamental principle of viral disease causation? A: One virus type induces a single disease syndrome. B: Many viral infections are subclinical and do not produce clinical disease. C: The type of disease produced by a virus can be predicted by the morphology of that virus. D: A particular disease syndrome has a single viral cause. E: Social factors do not influence the occurrence of viral diseases.
- Which of the following is NOT the basic pathological changes of viral hepatitis() A: Inflammation: Lymphocytes, plasma cells in portal tract B: Damages, Degeneration and Cell death C: Fibrosis D: Cell apotosis
- Which of the following statements is false? A: Viruses contain DNA or RN B: The nucleic acid of a virus is surrounded by a protein coat. C: Viruses multiply inside living cells using viral mRNA, tRNA, and ribosomes. D: Viruses cause the synthesis of specialized infectious elements.