Differentiate between the roles of B-lymphocytes and T-lymphocytes in generating immune responses.

OR

Principle of vaccination is based on the property of “memory” of the immune system. Taking one suitable example, justify the statement.

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Detailed Solution

B Lymphocyte	T Lymphocyte
They mature in bone marrow	They mature in thymus
They play a major role in humoral immunity	They play a major role in cell mediated immunity
They secrete antibodies	They do not secrete antibodies

OR
Immunological memory is the ability of the immune system to respond more rapidly and effectively to pathogens that have been encountered previously. Salk polio vaccine is a heat-killed attenuated vaccine. After administration, the vaccine generates memory – B and T-cells that recognise the pathogen quickly on subsequent exposure and overwhelm the invaders with a massive production of antibodies.

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