15. Humoral immune response is essential for combating pathogens. Which cells are responsible for producing antibodies? (A) T helper cells (B) natural killer cells (C) macrophages (D) plasma B cell (E) dendritic cells

10. Coagulation is a delicate mechanism controlling clot formation and preventing blood drainage. What kind of dietary deficiency and clotting factor deficiency would lead to defective blood clotting and hemophilia A? (A) vitamin E; factor VIII (B) vitamin B12; factor VIII (C) vitamin E; von Willebrand factor (D) vitamin B12; von Willebrand factor (E) vitamin K; factor VIII

15. Humoral immune response is essential for combating pathogens. Which cells are responsible for producing antibodies?
(A) T helper cells
(B) natural killer cells
(C) macrophages
(D) plasma B cell
(E) dendritic cells

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