Which statements correctly describe lymphocytes?
1) Each B-lymphocyte has the ability to make several types of antibody molecules.
2) Some B-lymphocytes and T-lymphocytes become memory cells.
3) Plasma cells secrete antibodies into the blood plasma.
4) Some T-lymphocytes stimulate macrophages to kill infected cells.
1 )
1, 2, 3 and 4
2 )
1, 2 and 3 only
2, 3 and 4 only
4 )
1 and 4 only
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