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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.
What is metagenesis? What are the other names of this process? Metagenesis is the type of life cycle in which there are two dissimilar forms of individuals of the same species,
Q. How do fishes do gas exchange? Fishes "breath" through gills, branchiae or Gills, are highly vascularized organs specialized in gas exchange under water and present in aquat
Polymorphism in Lysosomes Polymorphism, i.e. existence of a structure in more than one form, is an important feature of lysosomes. Several different forms of lysosomes have been
COMMO N EYE DEFECTS - 1 . Glaucoma - Pressure of aquous humour is increased, retina is degenerated. 2 . Presbyopia - Due to non etastic cilliary muscles,
State about Bone physiology Bone physiology that is most relevant to the study of mechanically mediated bone adaptation and its relevance in implant dentistry. These aspects in
Why the orange trees are often sprayed with water? Although it is grossly counter-intuitive, whenever citrus groves are in risk of experiencing below-freezing temperatures, the
What is Anti-arrhythmic pacemaker defibrillators ? Antiarrhythmic drugs (AADs) are classified according to whether they exert blocking actions predominantly on sodium, potassiu
Q. How to calculate Hydrogen Ion Concentration? Ans. The hydrogen ion concentration has a significant role to play in growth of bacteria as every microorganism has a minim
Embryos Prom Synergids The synergids, which usually degenerate prior to or soon after double fertilization, are reported to give rise to embryos in Argentine mexicana, Tamari
Describe three ways that RNA differs from DNA. RNA is single stranded; DNA is double stranded all of the codons from the deletion point to the end of the transcript would be s
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