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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.
What is the relationship between the concept of reproductive isolation and the concept of species? The Reproductive isolation is an important concept because it defines the con
Roan (RW) is a color of cattle in which both red and white hairs are present due to codominance. What are the phenotype and genotype ratios of offspring produced by: roan bull and
Filariasis Filariasis is a chronic infection caused by filarid worms. Around 10 species of Filaridae family are parasitic to man. Adult worms live in the tissues or body cavities
why is virus an exception of cell theory
PROTOPLAST Cell without cell membrane (Henstein) It contains 1 or more vacuoles. In mature plant cells protoplast forms a peripheral layer called Primordial utricle.
what is the tubular digestive tract?
Chromosomes are the condensed, fibrillar, self- replicating genetic structures of cells containing the cellular DNA which bears in its nucleotide sequence the linear array of gene
What is the mode of nutrition in fish,human,amoeba,scorpian & toad ?
Predation is a process by which one organism (predator) eats another organism (prey). If the prey population is abundant, the predator population also becomes abundant. If the pred
What is a characteristic feature of a carrier protein in a plasma membrane? Carrier proteins are globular proteins which are particular it their action and therefore regulate t
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