Pertussis (whooping cough) is an epidemic disease that is a highly contagious, acute infection of the upper respiratory tract caused by the:
a. Brucella spp.
b. Bordetella spp.
c. Pasteurella spp.
d. Francisella spp.
B
Before the introduction of vaccines and in populations in which immunization is not performed, pertussis (whooping cough) is an epidemic disease with cycles every 2 to 5 years. Pertussis is a highly contagious, acute infection of the upper respiratory tract caused primarily by Bordetella pertussis and less commonly by Bordetella parapertussis.
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Antimicrobials that inhibit the growth of microorganisms have the suffix
A. -cidal. B. -static. C. -anti. D. -genic.
Photoautotrophs use the energy stored in the products of photosynthesis directly to run the diverse reactions that sustain life
1.True 2.False
Why are BLAST comparisons based on protein sequences often easier to interpret than those based on DNA sequences?
What will be an ideal response?
A scientist performs a controlled experiment. This means that
A) the experiment is repeated many times to ensure that the results are accurate. B) the experiment proceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental data. C) two versions of the experiment are conducted, one differing from the other by only a single variable. D) one experiment is performed, but the scientist controls the variables.