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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.
Q. What is signifying when it is said that beings of the phylum Annelida are vascular beings? From which other phyla of the animal kingdom does this feature differentiate them?
Explain how the events of meiosis account for the law of segregation and the law of independent assortment. In meiosis, the two alleles of every gene are segregated when the tw
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An increase in blood plasma levels of parathyroid hormone A. occurs in response to enhance in the levels of calcium ions in blood plasma. B. leads to enhance in the amou
a) What new combinations of characteristics might arise in the offspring when a tall plant with white flowers is crossed with a dwarf plant (of the similar species) with red flower
Barriers to Fertilisation Incompatibility can occur anywhere from pollination to syngamy and consequently obstructing fertilisation. The pollen fails to germinate or the polle
Define Methods for determining pH? There are two general methods for determining pH of a solution. One is the colorimetric method and the other most common method is the use of
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Snakes Non-poisonous snakes can be brought into the classroom for observation. The diagram shows how a safe cage can be made for keeping a snake. The bottom should be covered w
What is the vestibular system? How does it operate? The vestibular system is the part of the ear that participates in the control and regulation of the equilibrium of the body
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