Allergic contact dermatitis is due to
A) sensitized T cells.
B) IgG antibodies.
C) IgE antibodies.
D) IgM antibodies.
E) activated macrophages.
A
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Boiling will not kill Giardia lamblia cysts in contaminated water.
Answer the following statement true (T) or false (F)
Sulfate-reducing bacteria (SRB) are very important in the cycling of sulfur within ecosystems because significant amounts of sulfate are present in almost all aquatic and terrestrial habitats, making SRB widespread and active.
Answer the following statement true (T) or false (F)
What do some scientists believe led to the increase in the level of oxygen in the atmosphere?
a. the first photosynthetic reactions b. photosynthetic cells that used water and not H2S as a source of electrons c. The development of cellular respiration pathways in cells d. the use of glycolysis in cells e. photosynthetic pathways that stripped oxygen off of carbon dioxide and retained only the carbon in subsequent steps
What plants have been significantly altered by humans through artificial selection?
A. maize B. rice C. wheat D. acorns E. Virginia creeper