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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.
Q. How are the male gametes of gymnosperms formed? What is the relationship between the pollen grains and the concept of alternation of generations? In the male strobiles (cone
Q. How are animals divided according to their kind of digestive process? At a distance from sponges that do not have a digestive cavity where extracellular digestion takes plac
What is difference between self pollination and cross pollination? Which of the two modes of pollination contributes more to the plant diversity? Self pollination take places w
Dextrorotatory:- When an optically .active substance rotates the plane of polarized light in a clockwise direction.
Aril - Seed Appendages It is an outgrowth that arises from the funicle or the testa near the raphe and covers the seed partially or completely. It is often referred to as the
Pollution - Environmental Pollution Pollution refers to any undesirable change in the physical, chemical or biological characteristics of our environment, i.e. air, water and
Bovine ephemeral fever Ephemeral fever is commonly known as 'three-day sickness'. It affects mainly cattle and occasionally sheep in India. Causative agent is a mosquito-borne vir
Explain Iron Uptake by Cells? Iron participates in a large number of biochemical reactions. However, for iron to perform any function, it first needs to be taken up by the cell
What are epithelial tissues? What are their general function and how is that function associated to the features of the tissue? Epithelial tissues, also known as epithelia, are
What is homogenization Emulsions may also be stabilized by a process known as homogenization, in which the size of the dispersed fat globules is greatly reduced to more or less
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