1. What are the two types of immunity? adaptive, innate active, adaptive inactive, innate acquired, inactive

2. Which of these are the most abundant in circulation? neutrophils mast cells basophils dendritic cells

3. Which of these is a professional antigen presenting cell (APC)? erythrocytes dendritic cells mast cells eosinophils

4. Which of these is a secondary lymphoid organ? Spleen Heart Kidney Brain

5. T cells require two signals to be activated. One signal is the binding of the antigen presented by the antigen presenting cell (APC). The other is the binding of co-stimulators partner molecules helper molecules interfering molecules

6. What kind of cells produce antibodies? T cells B cells NK cells Neutrophils

7. How are the different isotypes of antibodies produced? somatic hypermutation class switching evolution randomly produced

8. Which of these is an autoimmune disease? Rheumatoid Arthritis All of these Graves Disease Systemic Lupus Erythematosus (SLE)

9. What can be a cause of immunodeficiencies? Genetic factors All are correct Malnutrition Drugs used to treat certain diseases

10. What is hypersensitivity? Elevated levels of hormones A sensitive character Allergic reactions Excessive emotions