(Solved): 1. Complement component C3 is eleaved by: A. C3b B. CBbBb C. Factor B D. Factor D 2. The membrane a ...

1. Complement component $$\mathrm{C}3$$ is eleaved by: A. C3b B. $$\mathrm{CBbBb}$$ C. Factor $$\mathrm{B}$$ D. Factor D 2. The membrane attack complex in the complement pathway consists of: A, C3b3b,Bb C. Colicins B. C $$5b,6,7,8,9$$ D. $$\mathrm{OHH}$$. 3. Complement component C3b: A. Directly injures bacteria. C. Is chemotactic. B. Is an anaphylatoxin. D. Opsonizes bacteria. 4. A complement component that is strongly chemotactic for neutrophils is: A. C3.B. C3b C. C5a D. CSb 5. The initial complement component that is bound by complement-fixing antibodies is: A. Clq B. Cls C. C3b D. CSa 6. Several of the complement components are: A. Antibodies B. Cytokines C. Enzymes D, Glycolipids 7. The classical and alternative pathways meet at complement component: A. $$\mathrm{C}3$$ B. C4 C. C4b D. C5 8. One principal function of complement is to: A. Bind antibodies attached to cell surfaces and to lyse these cells B. Cross-link allergens C. Inactivate perforins D. Mediate the release of histamine 9. The major role of the complement system is to work in conjunction with A. Antibodies to lyse cells via the C8 and C9 components B. Antibodies to lyse cells via the perforin molecules C. Antibodies to opsonize cells D. The major histocompatibility complex for cell recognition 10. Complement fixation: A. Can be modified by the cholera toxin B. Has extrinsio guanylate cyclase activity C. Can be desensitized by phosphorylation D. Is an effector function of $$\mathrm{IgG}\mathrm{G}$$ and $$\mathrm{IgM}$$ following antigen binding: