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  1. In which one of the following antibody formations takes place ?
    1. RBCs
    2. Blood Platelets
    3. Blood Plasma cells
    4. Donnan's membrane
Correct Option: C

Blood plasma cells form 55-60% by volume of blood. Antibodies and some other substances such as lysozyme and properdin always occur in the plasma. They serve to destroy bacteria, viruses and toxic substances that may enter into the blood from outside or from body tissues.



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