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Q. How does the cellular immune response take place?
The lymphocytes that participate in the cellular immune response are the T lymphocytes and T lymphocytes differentiate into three major types: helper T lymphocytes (helper cell), cytotoxic T lymphocytes (cytotoxic T cell) and suppressor T lymphocytes. The cytotoxic cells are the effectors of the system that is they directly attack other cells recognized as foreign (for example, cells infected by virus, fungi cells, neoplastic cells, graft cells, etc.). The suppressor T lymphocytes and the helper cells act as regulators of the system releasing substances that respectively stimulate and inhibit the immune action of T and B lymphocytes. After the primary immune response memory T lymphocytes also remain in the circulation to provide more effective reaction and as well faster in case of future infections.
What is the classification that divides orders? Orders are divided into Families. The hierarchy of classification of living things most usually used is, from broadest to nar
Q. How is female gametophyte formed in angiosperms? Into the flower ovary there are megasporangia enclosed by a tegument having a small opening, the micropyle. Inside the megas
Cephalisation - Metazoa Bilateral animals when creeping or swimming, have a tendency to keep the same end of the body forward and the same surface down towards the substratum.
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Regulation of Glycogenesis Glycogen synthase, the key enzyme in glycogenesis, is activated by insulin and glucose and inhibited by CAMP.
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Chemical disasters arise from harmful and potentially hazardous chemicals, which if released of misused can pose a threat to the environmental. Its range depends upon military and
Q. What are the hexoses? What are some examples of hexoses with vital biological functions? Hexoses are carbohydrates whole of six carbons. Galactose, fructose and Glucose are
Response to Flooding Prolonged flooding or water-logging creates anaerobic conditions for the sub-surface parts of the plant and synthesis of alcohol dehydrogenase (ADH) helps
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