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Q. Why is it difficult to produce efficient vaccines against a viral infection like dengue and AIDS?
It is difficult to make vaccines for dengue because there are four different types of viruses that cause the disease (DEN1, DEN2, DEN3 and DEN4) and it is supposed that the protection against one of them aggravates the clinical manifestation when the person is later infected by the another dengue virus similarly, In the case of HIV, the production of a vaccine is difficult because the virus is highly evades and mutant the antibody action.
SCOPE OF BIOLOGY- Present century is witnessing explosion of information in modem biology directly related to life and health. Issues like global warming, pollution, populat
Q. What do you mean by Herbaria and Museums? A herbarium is a collection of pressed and dried plants arranged according to some valid system of classification and available for
Q. What are the most important structures within the cell nucleus? Within the cell nucleus the most important structures are the nucleolus, an optically dense region, spherical
main external morphological feature that differentiates platyhelminthes from nematodes
What is Ionic bonds ? Ionic Bonds : Ionic bonds hold atoms together in crystals. They form when oppositely charged atoms, or ions, join (opposite charges attract) to equaliz
Define the Fehling's Soxhlet method (Lane-Eynon method)? This is a titrimetric method that is commonly used in food laboratories to estimate percentage of reducing sugars and t
Give three examples of genetic engineering that are intended to improve crop plants. Genetic engineering of crop plants can improve resistance to pests, retard ripening, impro
What gases will be taken in and given out by a green plant (a) in darkness, (b) in bright sunlight? a) In low light intensities a green plant will be taking in oxygen and
Define
What group did reproduction via sexual exchange of genetic information originate in?
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