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Why is it difficult to produce efficient vaccines against a viral infection like dengue and AIDS?
It is complex to make vaccines against dengue because there are four dissimilar 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.
In the case of HIV, the production of a vaccine is complex because the virus is highly mutant and evades the antibody action.
Q. What is the evolutionary advantage of the occurrence of larval stage and sperm cells in the life cycle of sponges? The sexual reproduction in sponges in addition to contribu
State the Versions of Binocular movements Versions are movements of both eyes in the same direction. a) Dextroversions: Movements of both eyes to'the right side. b) Levov
Natality Rate - Natality Natality rate or birth rate is determined by dividing the number of individuals born by unit time and is expressed as follows: Natality rate = ΔNn
Q. What is the difference between lungs and gills? Lungs and Gills are richly vascularized organs that serve for gas exchange between the environment and the circulatory system
Removal of obturating material -Gutta percha . -Carrier bassed gutta perca. -silver points . - paste type. - obstructed fracture instrument .
What is the structural difference between plasmalogen and other glycerophospholipids? What physiological advantage arises from this structural difference?
a) Describe with the help of a suitable example for each of the following terms : (i) morphallaxis (ii) epimorphosis and (iii) compensatory regeneration.
How do biodiversity, the total number of living beings and the biomass respectively vary during the ecological succession? Biodiversity, the number of living beings and the bio
In what way do chlorofluorocarbons (CFCs) cause global problems? Chlorofluorocarbons react with and deplete the ozone in the ozone layer. This permits more ultra-violet light f
What is the difference between spermatocyte I and spermatocyte II? The spermatocyte I (2n) undergoes the primary division of meiosis (meiosis I) originating two spermatocyte II
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