Although Epsilonproteobacteria make up the smallest of the five proteobacterial classes, species such as Helicobacter and Campylobacter are responsible for significant human disease that range from mild to severe.
Answer the following statement true (T) or false (F)
True
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The ________ model was proposed by Mitchison and Kirschner to explain how polymerization and depolymerization of microtubules occur simultaneously.
Fill in the blank(s) with the appropriate word(s).
Endotoxin
A. consists of LPS. B. determines bacterial shape. C. may have different effects depending on the specific bacterial source. D. is toxic due to the effects of the peptide side chains. E. determines bacterial shape, may have different effects depending on the specific bacterial source, AND is toxic due to the effects of the peptide side chains.
Which regulatory protein is mismatched with its function?
a. Type I interferons?inhibit viral replication b. interleukin-1?resets body's thermostat, resulting in fever c. tumor necrosis factor?kills tumor cells d. cytokines?secrete antibodies e. Type II interferons?stimulate macrophages to destroy tumor cells
Figure 17.9
The graph above shows the survival of sociable weavers as a function of body mass. Sociable weaver body mass seems to be an example of ____.
A. directional selection B. stabilizing selection C. sexual selection D. disruptive selection E. artificial selection