All of the following are characteristics of endotoxins except
A. Is a product of the LPS layer
B. Does not trigger an inflammatory response
C. Cannot be converted to toxoid
D. Usual source is Gram negative bacteria
E. Only exposed when the cell dies
Answer: B. Does not trigger an inflammatory response
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The mechanism by which antigen-reactive cells respond to foreign antigens while ignoring self-antigens is called clonal
A) selection. B) deletion. C) anergy. D) expansion.
Which one of the following is an adaptation shared by virtually all complex multicellular organisms that allows the organisms to receive the oxygen and nutrients they need?
A. amplification of surface areas B. active transporters for oxygen and glucose C. restricted body size that corresponds to the environment D. tissues or organs that function as pumps
The division of cytoplasm is ____________________
A directional adjustment of growth in response to environmental stimuli is called ____.
A. circadian rhythm B. vernalization C. photoperiodism D. statolith E. tropism