Final answer:
The characteristic of anti-M antibodies that is incorrect is option C: They do NOT bind complement. Anti-M antibodies can and often do bind complement, while naturally occurring anti-A and anti-B antibodies can cause agglutination and hemolysis when encountering their corresponding antigens.
Step-by-step explanation:
The question pertains to the characteristics of anti-M antibodies, which are antibodies directed against the M antigen on red blood cells. Among the statements given, A (They react stronger with enzymes), B (Ab's may exhibit an IgG component), and D (They are naturally occurring Ab's) are all characteristics of anti-M antibodies. However, option C (They do NOT bind complement) is incorrect because naturally occurring antibodies such as anti-M can often bind complement. In contrast, anti-A and anti-B antibodies are known to be naturally occurring and can cause agglutination and hemolysis if they encounter their respective antigens.
Antibodies are produced by B cells in response to exposure to environmental antigens from food and microorganisms. IgM is typically the class of antibody secreted early in the adaptive immune response, forming pentamers that can bind ten identical antigens but with less stability compared to IgG antibodies, which are produced upon re-exposure to the same pathogen and bind more strongly and stably.