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Q. Why is AIDS difficult to prevent by vaccination?
It is not easy to produce a vaccine against AIDS because the HIV is a highly mutant virus. In approximately every replication the produced viruses have different proteins in their surface making difficult their recognition by the immune system.
Photosynthetically Active Radiation This is usually in direct proportion with the incident solar radiation, you know that tropic$ are probably the best illuminated part of the
MUTATION THEORY (Hugo de Vries 1901) - New species are not formed by continuous variations but sudden appearance of variations i.e., mutation. Mutation are heritable and per
What is adaptive radiation? Adaptive radiation happens when a new population in a new environment, like an island, undergoes divergent evolution until the descendant population
The structure of leaves Borrow a microscope from another school, a doctor, or a hospital. Study the under- side of leaves and locate the breathing pores or stomata with the two
Caryopsis - Development of Fruit In cereals each carpel has one ovule and therefore the mature fruit has, just one seed. During maturation, very little or no cell divisions ar
Explain the Factors Affecting GI of Foods? A variety of factors affect GI of foods. The factors which affect the rate of glucose absorption from starchy foods and therefore the
What are steroids? What are some examples of steroids with a biological function? Steroids are lipids based in an angular combination of four carbon rings, three of them made o
The water on earth surface constitutes hydrosphere. About 75% of earth surface is covered with water and 97% of that water is present in oceans, which is very salty. We are only
How to increase in sodium conductance A complete motor neuron is removed from a frog and placed in normal physiological saline at 1 AM. The neuron is healthy. At 2 AM, the ph
Q. Describe Bentham and Hookers System? Bernard de Jussieu (1699-1776) tried to classify the plants in Royal Garden, Paris. During this exercise he developed a system of classi
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