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Q. How can an organism that once underwent contact with an antigen be immunized against future infections by the same agent?
This phenomenon is called as immune memory when an antigen makes contact for the first time with cells of the humoral immune system B lymphocytes that are producers of specific immunoglobulins against that antigen multiply and in days synthesize their antibodies this is called as primary response. Few of these specific B lymphocytes remain in the circulation for a long time, sometimes during the entire life of the individual, and they become the memory cells of the immune system when the body is exposed in the future to the same antigen the production of antibodies will be more intense and faster since the immune system is already prepared to react against that antigen this is called as the secondary response.
The state of balance in the internal environment of the body it includes control of the water balance of the blood, body temperature, blood sugar level and blood urea level. Each o
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Q. In which areas of the globe is gymnosperm abundance noteworthy? These plants are the typical vegetation of cold regions like the boreal forest or taiga of the northern hemis
What is the probability of two individuals (AaBBccDd and aaBbCcDd) having a child with the following genotype AaBBCcDD?
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