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Which is characteristic of complement components?


A) All are active enzymes.
B) They are synthesized only when antigen is present.
C) They play a major part in the inflammatory response.
D) They are mainly produced in lymphoid tissue.

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The lectin pathway is initiated by the presence of which of the following?


A) antibody
B) C3
C) mannose
D) C1qrs

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A native bacterial cell surface itself will activate complement via which pathway(s) ?


A) classical
B) alternative
C) lectin
D) two of these
E) all of these

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The C5 convertase of the classical pathway of complement activation is:


A) C3bBbP
B) C3bBb3bP
C) C4b2a3b
D) C4b2a

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A system of serum proteins that interact to enhance the immune response by producing cytolytic,chemotactic,and other effects best describes:


A) complement
B) fibrinogen
C) haptoglobin
D) CRP

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The recognition unit in the classical complement pathway consists of:


A) C4b2a3b
B) C5b6789
C) C1qrs
D) factor B

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Which of the following activities is associated only with the alternative pathway of complement fixation?


A) formation of a membrane attack unit
B) factor B and C3b combination
C) antigen-antibody combination
D) lysis

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Which of the following complement components has chemotactic activity?


A) C3b
B) C3a
C) C1qrs
D) C5b6789

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What is cleaved by C4b2a3b?


A) C3
B) C4
C) C5
D) C6

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Which complement factor polymerizes to cause lysis of a foreign cell?


A) C5
B) C6
C) C8
D) C9

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