Interferons
Virally infected cells produce and release small proteins called interferons, which play a role in immune protection against viruses.
<h3>What are Interferons ?</h3>
Interferons prevent replication of viruses, by directly interfering with their ability to replicate within an infected cell.
- They also act as signalling molecules that allow infected cells to warn nearby cells of a viral presence – this signal makes neighbouring cells increase the numbers of MHC class I molecules upon their surfaces
- So that T cells surveying the area can identify and eliminate the viral infection.
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Decomposers are responsible for <span>breaking down dead organisms from any of the classes of a food chain. Therefore, if the ecologist would want to include decomposers in the food chain she could add arrows that went all the way from the upper classes of the food chain, as well as arrows from all the other classes, down to the bottom of the food chain, where the decomposers could be placed. This is because it is the decomposers that give back to the soil the nutrients needed for the plants, and ultimately all others in the food chain, to survive.</span>