Study this page, and then select the "Test Yourself" link at the bottom of the page. Complete the "Antigen-specific immune response" and "White blood cell regulating production of antibodies and destruction of infected cells" problems. These are multiple-choice assessments. Choosing an option will bring you to a page with explanation. If this explanation is a "Tutorial," then read it carefully and return to the multiple-choice assessment. Be sure to complete both problems.