20.Interferons are considered as: A. Physical barriers B. Physiological barriers C. Cellular barriers D. Cytokine barriers
Option D. Interferons are proteinaceous in nature. These are released by the virally infected cell as a response to the attack. Interferons belong to the large class of proteins known as cytokines - the molecules used for communication between cells to trigger the protective defenses of the immune system that help eradicate pathogens. Interferons are named for their ability to 'interfere' (or act as a barrier) with viral replication by protecting cells from virus infections.
