The central nervous system (CNS) may become infected through the
A. bloodstream.
B. nerves.
C. extensions from bone.
D. ventricles.
E. bloodstream, nerves AND extensions from bone.
E.
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An IgG molecule has two
A. heavy chains. B. light chains. C. antibody binding sites. D. antigen binding sites. E. heavy chains, light chains AND antigen binding sites.
The force that pushes plant cells tightly against the cell wall and helps support softer tissues against the
force of gravity is
a. turgor pressure. b. isotonic pressure. c. diffusion pressure. d. concentration pressure. e. plasmolysis pressure.
In lakes and ponds, the open-water zone extending to the depth of light penetration is referred to as the ________ zone
Fill in the blank(s) with correct word
For several years, scientists have warned doctors of the danger of overprescribing antibiotics, such as penicillin. Scientists are concerned because __________.
a. humans will become tolerant to the effects of drugs b. the organisms that produce many of the antibiotics are overexploited and could become extinct c. natural selection can lead to strains of microorganisms resistant to these drugs d. the drugs will be metabolized more quickly by our bodies, decreasing their effectiveness e. None of the listed responses are correct.