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Solution

Answer:

44. (A) Specific immunity

Specific immunity, also called adaptive immunity is composed of highly specialized, systemic cells and processes that eliminate pathogens or prevent their growth.

45. (A)

MHC Class I molecules does not bind complement.

46. (D)

MHC CLass II are found on the surface of lymphocytes and antigen-presenting cells.

47. (D) CD4 T cells

CD4+ T cells, also called T helper cells gets activated when and antigen is bound to the MHC Class II protein.

48. (D) Cytotoxic T cells

Lymphocytes that destroy foreign cells or virus-infected cells are cytotoxic T cells.