Respond to statements 112–116 with reference to the five types
of white cells listed below.
a. macrophages
b. helper T cells
c. B cells
d. cytotoxic T cells
e. natural killer cells
D 112. These cells kill tumor cells but are not B or T
lymphocytes.
M 113. These cells scavenge dead cells and attack bacteria
directly.
D 114. These cells destroy cells infected by viruses.
D 115. These cells recognize cell surface antigens and
initiate the proliferation of lymphocytes.
M 116. Antibody production occurs in these cells.
Answers: 112. e, 113. a, 114. d, 115. b, 116. c
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