The chief source of central nervous system (CNS) infections is through the
A. bloodstream.
B. genitourinary system.
C. skin.
D. nerves.
A
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Which of the following groups of animals does NOT exhibit a "double circulation" and four-chambered hearts?
A. mammals B. birds C. crocodilians D. snakes E. All of the groups listed exhibit a complete double circulation.
Primary metabolites
A. are compounds needed for the synthesis of microbial cells in the primary growth phase. B. are compounds that accumulate during the period after primary growth phase and have no direct relationship to the synthesis of cell materials. C. include bacteriocins and other similar cytotoxic compounds. D. include compounds such as antibiotics and mycotoxins.
Which biome has the greatest number of distinct layers of vegetation?
a. savanna b. tropical rain forest c. desert d. chaparral e. grassland
The early placental membrane has all of the following layers, EXCEPT:
A. Connective Tissue B. Cytotrophoblasts C. Endothelium of Fetal Capillaries D. Endothelium of Maternal Capillaries E. Syncytiotrophoblasts