A) antigen
B) antibody
C) interferon
D) intron
Correct Answer: C
Solution :
Interferon are the proteinaceous product released by the cells in response to virus infection and fight against the viruses. Intact, interferon prevent the cell from viral attack by making the unattacked cells less susceptile rather than inactivating the virus. Antigen is any foreign molecules that can trigger a specific immune response. Most of them are either proteins or large polysaccharides e.g.. Dust, pollen, micro-organisms etc. Antibody are specific proteins produced to destroy antigen. They are known as immunoglobulins. They are of 5 kinds: \[\text{IgA, IgM, IgG, IgE, IgD}\] Introns refer to interrupted or non-coding genes in vkaryotes. They do not code for any protein.
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