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
3 )
1 and 4 only
2, 3 and 4 only
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