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Q. What is the virus that causes flu? Why doesn't the body produce permanent immunity against that virus? How does the vaccine against flu work?
Flu is a disease caused through the influenza virus, a highly mutant DNA virus, Due to the high mutation rate of the virus that forms many different strains flu always presents epidemic features in affected populations and people may have several flu episodes during life (the immune response made from previous infections is not proficient in future infections).
The injection against flu is a vaccine made of attenuated virus of three different strains. Each year the World Health Organization (WHO) researches and determines which the strains that should compose the vaccine are. This is a approach to face the high mutation rate of the virus.
Why do scientists make biological collections? What are the scientific reasons for doing a collection? How is a collection done?
The two gases making highest relative contribution to the greenhouse gases are: 1. CO2 and CH4 2. CH4 and N2O 3. CFC55 and N2O 4. CO2 and N2O CO2 and CH4
A Molecule of DNA is 2.17 um long. The ends of the molecule become strongly ionixed: negative on one end, positive on the other. The helical molecule acts like a spring and compres
Limb Field By several marking and transplantation methods it is feasible to identify in early embryos the specific areas of groups of cells that ultimately make different org
It is IgG mediated cytotoxic hypersensitivity. Typical manifestations contain erythroblastosis fetalis, hemolytic anemia, blood transfusion reactions etc.
Explain how human activities can cause an imbalance in biogeochemical cycling and lead to problems such as cultural eutrophication and fish kills.
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Q. Revenue Recognition on Long-term Construction Projects? Revenue Recognition on Long-term Construction Projects Company identifies revenue from a long-term construction proje
Q. Of what substance is the plant cell wall made? Of which monomer is it made? The plant cell wall is made of cellulose. Cellulose is a polymer whose monomer is glucose. There
Define Intra enterocyte transport - non-haem iron absorption? Intra enterocyte transport: In the enterocyte, the absorbed iron can have one of the following metabolic fates:
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