Which statement about cancer defense is FALSE?
a. Natural killer and T cytotoxic cells destroy cancer cells.
b. Cancer antigens stimulate a strong immune response.
c. Monoclonal antibodies can deliver toxic drugs to cancer cells.
d. T cells produce interleukins, which defend against cancer.
e. Macrophages produce tumor necrosis factor, which inhibits tumor growth.
b
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Which of the following is not a photosynthetic pigment?
A. Phycobilin B. Carotenoid C. Leukophyll D. Chlorophyll
Major gene reshuffling takes place during
a. telophase I. b. metaphase I. c. anaphase I. d. metaphase II. e. anaphase II
Our species emerged approximately:
A. 4 mya B. 2 mya C. 1 mya D. 150 kya E. 10 kya
Archaeal cell walls
A. are disrupted by treatment with lysozyme or penicillin. B. include orthomureine. C. are similar to those of Gram-negative bacteria. D. lack murein and D-amino acids.