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
A: act on target cells to inhibit viral replication
B: act directly on the virus
C: are virus-specific
D: all of above
举一反三
- 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.
- Which of the following cannot be studied by tissue culture?() A: Effects of drugs on cells B: Canceration of cells C: Replication of human disease models D: Chromosomal variation E: Virus replication
- High temperatures ( ) and low temperatures ( ). A: sterilize, disinfect B: kill cells, inhibit cell growth C: denature proteins, burst cells D: speed up metabolism, slow down metabolism
- Proteins are the principal constituents of cells and determine not only cell structure but also cell function.
- All cells have a cell membrane made of proteins and ( ). A: lipids B: glucose C: amino acid D: fructose