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Q. Why does not a long lasting vaccine against common cold exist yet?
Viruses that present a high mutation rate like the virus that causes the common cold escape easily from the action of vaccines against them. After a primary immune response (artificially or natural induced) against the virus in the next season of infection new mutant resistant strains appear and the protection obtained with the immune response of the last season is lost (One could say that the high mutation rate is a form of "immunization" found by these viruses.)
Salt Glands in Birds and Reptiles Marine reptiles for example, iguanas, estuarine sea turtles, crocodiles, sea snakes and marine birds like the marine teleosts do not produce
In glycoproteins, two main parts of oligosaccharide linkages exist: a) An O-linked oligosaccharides attached to the protein by O-glycosidic bonds, to the OH groups of serine or
Difference between other eukaryotic cells ? Cell Wall : In addition to the presence of photosynthetic plastids, another significant difference between other eukaryotic cell
Vibriosis/campylobacteriosis This is genital disease of cattle and sheep. The causal organism Campylobacter fetus is a gram negative, curved or spiral shaped bacteria having s
Determine the Uni-ocular movements Uni-ocular movements are the movements of one eye studied at a time. That means, when left eye is covered, then movements of uncovere
Q. What do you mean by QRS Changes? The total amplitude of the QRS compared with exercise usually decreases near peak workload, as well as the T-wave amplitude, and there is a
Digestive Tract Extracellular digestion takes place in a tubular cavity that extends throughout the length of the organism. All animals after flatworms have-a tubular alimenta
NEO-LAMARCKISM Modem modified form of Lamarck theory is regarded as Neo-Lamarckism. Mc Dougall (1938) found that time taken for training the mice was reducing gradually
Q. Principles of Binomial Nomenclature? There are certain, basic principles of binomial nomenclature which are as follows: i) Different nomenclatural systems are independent
What are the excretory organs in protozoa.
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