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IgM Is Particularly Efficient at Fixing Complement Because It _____

Question 47

Multiple Choice

IgM is particularly efficient at fixing complement because it _____.


A) is a much larger antibody than the other isotypes
B) has an extra CH domain
C) is made first in an immune response and therefore has first access to C1q
D) has five binding sites for C1q
E) has easy access to extravascular areas.

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