Antigens are ________.
A) immunoglobulins
B) used by the immune system to neutralize foreign objects
C) foreign molecules that can initiate an immune response
D) produced by white blood cells

Question

Quizplus · Accepted Answer

Antigens are foreign molecules that can initiate an immune response by activating the production of antibodies by B cells or by directly activating T cells. Immunoglobulins (choice A) are antibodies produced by B cells in response to antigens. They are not antigens themselves. Choice B is incorrect because antigens are not used by the immune system to neutralize foreign objects; rather, they are the foreign objects that activate the immune response. Choice D is incorrect because white blood cells produce many different types of molecules, not just antigens.

Antigens Are ________