Four of the five answers listed below are sources of air pollution. Select the exception
a. carbon dioxide
b. oxides of nitrogen
c. oxides of sulfur
d. chlorofluorocarbons
e. water vapor
E
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A positive tuberculin test means a patient
A) has active disease. B) has been previously exposed to Mycobacterium tuberculosis. C) has a current inappropriate infection. D) has active disease, has been previously exposed to Mycobacterium tuberculosis, or has a current inappropriate infection.
These organisms most specifically utilize light energy to make organic molecules from inorganic molecules.
A. photoautotrophs B. photoheterotrophs C. photoisotrophs D. photohemitrophs E. heterotrophs
The internal skeleton of species in the subphylum Vertebrata provides both structural support for muscles and
protection for internal organs.
a. True b. False
Of these steps, which one occurs earliest in the process of producing recombinant DNA?
A) Human DNA fragments are mixed with the cut plasmids. B) The same restriction enzyme is used to isolate the gene of interest and to cut the plasmid DNA. C) The recombinant plasmids are mixed with bacteria. D) Bacteria carrying recombinant plasmids are cloned.