A person is infected with Streptococcus pneumoniae, an extracellular bacterium. Which cells of the adaptive immune system will be the most important in the immune response to this bacterium?


Helper T cells and cytotoxic T cells
B cells and cytotoxic T cells
Helper T cells and B cells
B cells and neutrophils

Describe how the clonalexpansion theory explains the more rapid production of antigenspecific antibodies, Helper T-cells and Cytotoxic T-cells, during asecondary infection.

2) Describe how the explains the more rapid production ofantigen specific antibodies, Helper T-cells and CytotoxicT-cells,

Define the function of each of the following types of cells: B cells, T cells, helper T cells, cytotoxic T cells, macrophages, natural killer cells, and memory cells