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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.
Diagram of a cell surface membrane. State the width of a cell surface membrane. (i) On which side of the membrane, shown in Figure, X or Y, is the cytoplasm of the cell?
Explain the Absorption of Protein? Although single amino acids are liberated in the intestinal contents, there is insufficient power in the enzymes of the pancreatic juice to r
Define Practical Preparation - Qualitative Test for Monosaccharides? 1. Wear your labcoat. Make sure your hair is tied and you have no loose clothing. These can be dangerous in
What are the major respective constituents of cell walls in bacteria, protists, fungi and plants? Ans) In bacteria cell wall is made of peptidoglycans; between protists algae ha
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tell me how to write a report in molecular biology?
In E. coli there are seven rRNA transcription units scattered by the genome, each of that contains one copy of every of the 16S, 23S and 5S rRNA genes and one to four c
Functions of Respiratory Pigments As you have learnt in the preceding sub-sections, the pigments are the carrier of oxygen. In the nonexistence of respiratory pigments the blo
Q. What is the menstrual cycle? The menstrual cycle is the periodic succession of interactions between the organs and hormones of the female reproductive system after the begin
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