Positive Selection of Lymphocytes Refers to The

Question

Positive selection of lymphocytes refers to the
A) processing of an antigen by a macrophage.
B) proliferation of natural killer cells.
C) production of antigen-specific antibodies.
D) survival of pre-B and pre-T cells that are capable of an immune response.
E) replication of memory cells.

Accepted Answer

Positive selection of lymphocytes refers to the survival and maturation of pre-B and pre-T cells, which are capable of an immune response. This occurs in the bone marrow and thymus, respectively, and involves interactions with specific proteins that ensure the lymphocytes can respond to antigens. The other options listed refer to different aspects of immune function, such as antigen processing, antibody production, and memory cell replication, but are not directly related to positive selection.