Movement of spirochetes occurs by means of structures called
A. cilia.
B. flagella.
C. endoflagella.
D. pili.
C
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Crossing-over is
A) the place on a homologous pair of chromosomes at which a physical exchange occurs. B) an extremely rare event. C) an event that only takes place during meiosis. D) the reciprocal exchange of homologous regions of chromatids. E) not useful in mapping genes.
If all of the hairlike structures, called ________, in respiratory passages suddenly stopped working, a person would probably have more respiratory infections
Fill in the blank(s) with correct word
The corpus callosum links the
A) forebrain and midbrain. B) right and left cerebral hemispheres. C) peripheral and central nervous systems. D) thalamus and hypothalamus. E) cerebrum and thalamus.
After much study, ecologists have come to the conclusion that competitive exclusion
A. occurs rather frequently in nature. B. occurs more frequently in tropical habitats than temperate ones. C. occurs very rarely in nature. D. occurs more frequently on islands than on the mainland.