Escherichia coli and Salmonella can live in our intestines in the presence or absence of oxygen. The are considered
A. obligate anaerobes.
B. phototrophs.
C. facultative anaerobes.
D. autotrophs.
E. aerobic.
Answer: C. facultative anaerobes.
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11. Chemical evolution started on Earth ____. a. after the appearance of prokaryotic cells b. long before any cells emerged c. after the appearance of eukaryotic cells d. after the appearance of eukaryotic cells but before the appearance of multicellular organisms e. after the appearance of multicellular organisms
Four of the five choices listed below are related by a
similar function. Select the exception. a. intercostal muscles b. pleural sac c. atmospheric pressure d. diaphragm e. carotid bodies
Over many generations man has chosen certain desirable characteristics in dogs by allowing dogs possessing those characteristics to reproduce. In this way, 150 breeds of dogs, all the same species, have descended from wolves. This process is referred to as
A. convergent evolution. B. natural selection. C. inheritance of acquired traits. D. artificial selection.
The Intoxilyzer uses fuel cells to determine the concentration of alcohol in a person's breath.
a. true b. false