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What is the virus that causes flu? Why doesn't the body create permanent immunity against that virus? How does the vaccine against flu work?
Flu is a disease caused by the influenza virus, a highly mutant DNA virus. Because of the high mutation rate of the virus, that forms many dissimilar strains, flu always presents epidemic features in affected populations and people may have some flu episodes during life (the immune response made from previous infections is not efficient in future infections).
The vaccine against flu is a vaccine made of attenuated virus of three dissimilar strains. Each year the WHO (World Health Organization) researches and determines which are the strains that should compose the vaccine. This is a method to face the high mutation rate of the virus.
Biological Significance of Incompatibility Both interspecific and intraspecific incompatibility determines the degree of inbreeding and out breeding of plants. Self-incompati
Q Beings from four phyla of the animal kingdom "breath" (do gas exchange) by diffusion. Which are those phyla? How is this type of respiration associated to features present in tho
Q. What are the target organs upon which glucagon and insulin act? Glucagon mainly acts upon the liver and Insulin acts generally upon all cells. Both also act upon the adipose
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photoorganoheterotrophs why don''t use light for photosynthesis?
Q. What are some prophylactic measures against HIV infection? The major prophylactic measures against HIV infection are: the use of condoms in sexual relations, not to share ne
Define Disadvantages of using Bacteria as a source of protein? Disadvantages of using Bacteria as a source of protein are as follow: a) If the bacterial strain is very small
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