Question

Which of the following pairs is mismatched?

a. plasma cell: mediation of phagocytosis and killing of
microorganisms in the plasma
b. megakaryocyte: formation of platelets
c. dendritic cell: activation of adaptive immune responses
d. natural killer cell: develops from a common lymphoid
progenitor
e. neutrophil: formation of pus
f. regulatory T cell: inhibition of T-cell activity.

Answer 1

a. plasma cell: mediation of phagocytosis and killing of microorganisms in the plasmThe mismatched pair is 'plasma cell: mediation of phagocytosis and killing of microorganisms in the plasma,' because plasma cells are mainly responsible for antibody production, not phagocytosis.

Step-by-step explanation:

The question asks which pair is mismatched among a list of cell functions and types in the immune system. The mismatched pair is plasma cell: mediation of phagocytosis and killing of microorganisms in the plasma. Plasma cells, derived from B cells, are primarily responsible for producing antibodies rather than mediating phagocytosis and killing of microorganisms. Action such as engulment and digestion of pathogens is typically the role of professional phagocytes like macrophages and neutrophils, not plasma cells.

Megakaryocytes are indeed involved in the formation of platelets, which are critical in stopping bleeding. Dendritic cells play a crucial role in the activation of adaptive immune responses, and natural killer (NK) cells, which derive from a common lymphoid progenitor, are part of the innate immune system and can kill virally infected cells and tumor cells. Neutrophils are associated with the formation of pus during infections, as they are abundant phagocytic cells that accumulate at infection sites. Lastly, regulatory T cells, also known as suppressor T cells, are indeed involved in the inhibition of T-cell activity to maintain immune homeostasis and prevent autoimmunity.The correct answer is:a. plasma cell: mediation of phagocytosis and killing of microorganisms in the plasma.A plasma cell is a type of B cell that produces and secretes large amounts of antibodies. These antibodies help in the phagocytosis and killing of microorganisms in the plasma, which is the liquid part of the blood.Plasma cells are responsible for producing antibodies as part of the adaptive immune response, while phagocytosis and killing of microorganisms are mainly performed by other cells such as macrophages and neutrophils.