INTERFERONS

 Interferons are present in birds, reptiles and fishes as well as higher animals.There are 3 main families of interferons: a, b and g. Gamma interferon is a cytokine which is characteristically a product of Th1-cells and natural killer (NK) cells.

1.Interferons are 
a) anti bacterial proteins 
b) anti-viral proteins
c) bacteriostatic proteins 
d) all of these
Ans.b

2.Antiviral glycoproteins released by living cells in response to viral attack and induce a viral resistant state to neighbouring cells is called as 

a) natural killer cells 
b) complement system 
c) interferons 
d) phagocytes

Ans.c

3. Interferons:
 A  Are found only in mammalian species.

 B  Are divided into 5 main families.
 C  Induce enzyme synthesis in the target cell.
D  Are specific for individual viruses.

Correct.  answer -C  Derepression of genes in the target cell result in the synthesis of a protein kinase and an endonuclease.

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