Antibody molecules are

Question

Quizplus · Accepted Answer

Antibody molecules are secreted by B cells, but they require a signal from T cells in order to do so. This signal comes in the form of a cytokine released by T cells specifically activated by the same antigen. Therefore, choice B is the most accurate answer. A is incorrect because antibody molecules have both variable and constant regions, which contribute to their specificity and function. C is incorrect because T cells produce a different type of molecule, called T cell receptors, which have variable and constant regions. D is incorrect because antibodies themselves, not external proteins, are responsible for inducing B cells to form memory cells. Finally, E is incorrect because while antibodies do have binding sites, this is not a defining characteristic of antibody molecules.

Antibody Molecules Are