The atom present in all organic compounds is
a. carbon.
b. oxygen.
c. nitrogen.
d. sulfur.
e. hydrogen.
Answer: a
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Until renamed by Paul Ehrlich in the 1890s, the heat-labile, nonspecific part of the immune system that enhances inflammation was known as "alexin". We now know that various proteins of this system attract neutrophils to tissues, direct phagocytosis of targets by neutrophils and macrophages, burst pathogens by insertion of the membrane attack complex (MAC), stimulate histamine release, and increase capillary permeability. What did Ehrlich rename this part of the immune system?
A. complement B. contingent C. Toll-like response D. acquired immunity E. MBL
Like all fatty acids, oleic acid is extremely hydrophobic. Why?
a. Because the hydrocarbon tails are charged. b. Because long hydrocarbon tails cannot interact with water. c. Because it has a multi-ringed structure. d. None of the above.
Four of the five answers listed below are particulate wastes. Select the exception
a. smoke b. soot c. asbestos d. dust e. ozone
Which biome probably contains the largest number and most diverse group of large mammals?
A) Savanna B) Tropical rain forest C) Desert D) Tropical deciduous forest E) Chaparral