Lymphocytes that develop immunocompetence in the bone marrow area. T lymphocytes,b. B lymphocytes,c. NK cells,d. B and T lymphocytes.

Type I hypersensitivity is due to release of inflammatory mediators from_____, and type IV hypersensitivity is due to the actions of_____.

a. TH cells; macrophages

b. neutrophils; TH cells

c. B cells; TC cells

d. mast cells; TH cells

Mark the following statements as true or false. If a statement is false, correct is to make a true statement.

a. In the primary immune response, the lag phase lasts about 5 days, during which time B cells proliferate and differentiate.

Epitopes are:

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

d. Cancer cells are destroyed by NK cells, TC cells, and macrophages.