The following events occur when a mammalian immune system first encounters a pathogen. Place them in correct sequence, and then choose the answer that indicates that sequence.

I Pathogen is destroyed

II Lymphocytes secrete antibodies

III Antigenic determinants from pathogen bind to antigen receptors on  lymphocytes

IV Lymphocytes specific to antigenitc detrminants from pathogen become numerous

V Only memory cells remain

The next question refers to the following data.

In which of the cases would the precaution likely be taken to give the mother anti-Rh antibodies before delivering her baby?

The following question refers to the diagram in Figure 43.2.

The "self and nonself" complex is represented by