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Q. What are the types of antigenic agents that may constitute vaccines?
Vaccines can be constituted of dead agents of disease, of inactivated toxins, of inactivated agents of disease or of fragments of the infectious agent.
Examples of some vaccines and their kind of antigenic agents are: bacilli; antitetanic vaccine, inactivated BCG, inactivated tuberculosis toxin; antidiphtheric, inactivated toxin; antipolio Salk, dead poliovirus; antipolio Sabin, attenuated (inactivated) poliovirus.
Deficiency of vitamin -A (hypovitaminosis-A) Vitamin A deficiency develops due to insufficient supply of the vitamin or its defective absorption from alimentary tract. The defi
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What are the types of reproduction that occur in fungi? In fungi there are asexual and sexual reproduction. Fungi replicate asexually by fragmentation, gemmation and sporulatio
DISACCHARIDES They are oligosaccharides composed of two monosaccharide residues . Three common disaccharides are sucrose (glucose + fructose) = cane suger maltose
How potassium is essential for the following physiological functions It is vital for photosynthesis. When K + ion is deficient, photosynthesis declines and respiration incr
Q. How to Investigate mitral stenosis by Echocardiography? Echocardiography is diagnostic in mitral stenosis. There is varying degrees of thickening and calcification of leafle
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Q. How can the features of the arthropod exoskeleton describe the terrestrial adaptation of some species of the phylum? In the arthropod exoskeleton there is a layer of wax whi
Mutations are the only kind of variability generating mechanism in prokaryotes and asexually reproducing organisms. But in eukaryotes where sexual recombination occurs, even in one
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