4.1 the immune system Flashcards
1
Q
what are antigens?
A
antigens are molecules found on the surface of cells
2
Q
what molecules are antigens usually?
A
molecules are usually proteins or polysaccharides
3
Q
when a pathogen invades the body, what are the antigens on the surface identified as?
A
when a pathogen invades the body, the antigens on its cell surface are identified as foreign
