In the indirect ELISA test to diagnose HIV virus the enzymel
     In the indirect ELISA test to diagnose HIV virus, the enzyme-linked antibody will attach to  Proteins on the surface of the HIV virus present in human blood sample  Serum suspected of containing antibodies against proteins on the surface of the HIV virus  The well of the microplate well  The lymphatic system consists of lymphatic vessels, lymphatic tissue, lymph nodes, and lymphoid organs such as _________ esophagus, laryngopharynx, and tonsils  thyroid, parathyroid and thymus  spleen, tonsils and thymus  pancreas, adrenal glands and spleen  This region of an antibody forms the antigen-binding site that binds a specific region in the antigen.  heavy chain only  constant portion of heavy and light chains  light chain only  variable portion of heavy and light chains   
  
  Solution
Answer:
3. (b) Serum suspected of containing antibodies against protien on the surface of the HIV virus.
Reason: It\'s this feature of the indirect ELISA that removes the drawback of direct ELISA for diagnosing HIV virus.
4.(c) spleen, tonsils, and thymus
Reason: Only these organs are part of the lymphatic system.
5.(c) light chain only.

