The second line of defense against invading microbes includes
A) the skin.
B) mucous membranes.
C) antibodies.
D) phagocytic white blood cells.
E) microbiota.
D
Bloom's Taxonomy: Comprehension
Section: An Overview of the Body's Defenses
Learning Outcome: 15.1
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Biological molecules with dipole moments:
A. are typically called nonpolar molecules. B. are typically called polar molecules. C. are found in environments in which they can interact with other nonpolar molecules. D. always display resonance. E. also have no single electrons in their outer valence shell.
The opening of the shells of some gastropods is protected by the:
a. parapodia. b. setae. c. operculum. d. head. e. cerata
Type II survivorship curves ____
a. are characteristics of humans and elephants b. typify a population in which all ages have an equal chance of survival c. indicate a high mortality rate in the very young d. show that very few young are produced, that each is given parental support, and that most individuals live a relatively long life and die of old age
e. are typical of annual plantsWhich property of antibodies is the basis for complement fixation tests?
A) agglutination B) opsonization C) neutralization D) direct killing E) complement activation