q&a

When immature B cells mature in the bone

marrow, they need to interact with

(A) stem cells present in the bone marrow

(B) stromal cells and cytokines such as IL7

(C) mature B cells present in the bone marrow

(D) antigen presenting cells with different B cell

epitopes presented on MHC II molecules
 

Antibodies which can cross placenta and are

involved in allergic reactions, respectively are

(A) IgG and IgA

(B) IgM and IgE

(C) IgG and IgE

(D) IgD and IgM