Four of the five regions listed below are located
within the spinal cord. Select the exception.
a. dorsal root ganglion
b. interneurons between sensory input and motor
outputs
c. major ascending and descending nerve tracts
d. interneurons connecting with other neurons
e. direct reflex connections between sensory and
motor neurons
Answer: a
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Loams are soils with the best water and oxygen
penetration because they have a. a high proportion of sand. b. a high proportion of silt. c. a high proportion of clay. d. high proportions of sand and silt and a low proportion of clay. e. equal proportions of sand, silt, and clay.
All of the following characteristics apply to the organism in Figure 21-2 EXCEPT?
a. marine reptile b. lived during the Triassic period c. body form resembled a porpoise d. large eyes e. enlarged sharp claws
____ is NOT a condition of the Hardy-Weinberg concept.
A. Random mating B. Lack of mutations C. Small population size D. Lack of migration
Please match the virulence factor of Streptococcus pyogenes to its description.
Hyaluronidase A) Surface antigen that serves as the basis for alphabetical grouping; protects bacterium from lysozyme B) Toxin that causes beta-hemolysis on blood agar and injures cells of the host C) Enzyme that plays a role in invasion by leading to the digestion of fibrin clots D) Projecting surface antigen that facilitates adherence and resists phagocytosis E) Chemical surface layer that prevents an immune response by the host F) Enzyme that promotes invasion into tissues by breaking down the binding substance in connective tissues