$B$-cells are lymphocytes which produce the humoral immunity. These cells are produced by
Liver
Spleen
Thymus
Bone marrow
Give differences: $T$-lymphocytes and $B$-lymphocytes
Name the primary and secondary lymphoid organs.
Antigen binding site in an antibody is found between
In the figure, structure of an antibody molecule is shown. Name the parts $A,\,B$ and $C$. Show $A,\,B$ and $C$ in the diagram.
Given below are two statements :
Statement $I:$Autoimmune disorder is a condition where body defense mechanism recognizes its own cells as foreign bodies.
Statement $II:$Rheumatoid arthritis is a condition where body does not attack self cells.
In the light of the above statements, choose the most appropriate answer from the options given below: