Biology 107

Study Guide: Defenses against disease II.

Chapter 43

1. Describe the difference between humoral immunity and cell-mediated immunity. Which line or lines of immunity do helper T lymphocytes function in?

2. What is an APC? How does an APC display the foreign antigen?

3. Distinguish between T-independent and T-dependent antigens.

4. distinguish between variable (V) regions and constant (C) regions of an antibody molecule. How does their structure allow antibodies to recognize and bind antigens, and assist in destruction and elimination of antigens.

5. How does an antibody mediate disposal of an antigen?

6. How do cytotoxic T cells recognize infected cells? How do they destroy these cells?

7. What cells are infected by HIV? How are AIDS and HIV related? How is HIV transmitted? How is it detected?