Nokea
Which of the following statements regarding the adaptive immune response is false?
Correct Answer: B
Rationale: Answer B is correct because the major histocompatibility complex (MHC) is indeed required for the activation of T helper cells by a foreign antigen. This is because T helper cells recognize antigens presented by MHC molecules on antigen-presenting cells. Without MHC presentation, T helper cells cannot be activated.
Choice A is incorrect because MHC molecules do display both self and non-self antigens, which is crucial for the immune system to distinguish between harmful invaders and healthy cells.
Choice C is incorrect because activated effector T helper cells can indeed activate both T and B lymphocytes/cells, playing a key role in coordinating the adaptive immune response.
Choice D is incorrect because T cells do not use 'chemical warfare'; instead, they directly attack infected cells, while B cells produce antibodies that target specific antigens.
In summary, choice B is false because the MHC is necessary for T helper cell activation, while choices A, C, and D are true statements regarding the adaptive immune response.