Which of these is a direct effect of antibodies?

Question

Quizplus · Accepted Answer

Antibodies directly bind to antigens and form antigen-antibody complexes. These complexes can then be recognized and bound by other components of the immune system, such as complement proteins or phagocytic cells, leading to the inactivation and removal of the antigen. Therefore, the direct effect of antibodies is to bind antigens and inactivate them by forming complexes. Option A is incorrect because macrophages do not phagocytize the antibody, but rather the antigen-antibody complex. Option C is incorrect because it is the Fc region, not the constant region, of the antibody that triggers mast cell degranulation. Option D is incorrect because the constant region of the antibody does not activate the complement system, but instead must first bind to an antigen in order to trigger complement activation.

Which of These Is a Direct Effect of Antibodies