Which of the Following BEST Explains the Timing of the Classical

question 7

Multiple Choice

Which of the following BEST explains the timing of the classical pathway of complement fixation, relative to the other pathways of complement fixation, against a pathogen in an individual who has never been exposed to said pathogen?

• A)No target for C1qrs exists on the surface of the pathogen in the earliest stages of the response to it.
• B)The chemical environment of the pathogen's surface favors the spontaneous activation of soluble C3 immediately upon exposure to the pathogen.
• C)C1qrs immediately recognizes carbohydrate antigens on the surface of the pathogen, allowing for rapid formation of the C4b2a C3 convertase.
• D)The pathogen expresses one or more factors on its surface that act as negative regulators of C3 convertase formation.
• E)None of the answers are correct.

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