A macromolecule that is capable of eliciting an immune response in an immunocompetent host is called a(an):

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Quizplus · Accepted Answer

An antigen is a macromolecule that can induce an adaptive immune response in an immunocompetent host. They are usually proteins, polypeptides, or large polysaccharides that are recognized by the immune system as foreign and stimulate an immune response. Antibodies are produced by the immune system in response to antigens, but they are not antigens themselves. Haptens are small molecules that are not capable of eliciting an immune response on their own but can do so when they bind to larger carrier molecules. Acute phase reactants are proteins that are produced by the liver in response to inflammation or infection, but they do not elicit an immune response.

A Macromolecule That Is Capable of Eliciting an Immune Response