Classification. Respond to the following statements with reference to the five types of white cells listed below.

A. These cells scavenge dead cells and attack bacteria directly.
B. These cells recognize cell surface antigens and initiate the proliferation of lymphocytes.
C. Antibody production occurs in these cells.
D. These cells destroy cells infected by viruses.
E. These cells kill tumor cells but are not B or T lymphocytes.


A. macrophages
B. helper T cells
C. B cells
D. cytotoxic T cells
E. natural killer cells

Biology & Microbiology

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The most common marine annelids are:

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