The source of sulfur for Hydrogen-Sulfide-producing bacteria in the Triple Sugar Iron Agar is
A. Sodium thiosulfate
B. Ferrous sulfate
C. Sodium sulfide
D. Ferric citrate
E. Sodium sulfate
Ans: A. Sodium thiosulfate
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Which of the following fossils are we most
likely to find?
a. fossils beneath the Empire State Building b. fossils of flowers that produce one seed c. jellyfish fossils d. fossilized spores from mushrooms e. fossils of animals living on steep slopes
With a _____ concentration of LDLs and a _____ concentration of HDLs, lipids can build up on artery walls leading
to _____.
a. low; high; atherosclerosis b. high; low; atherosclerosis c. high; high; hypertension d. low; low; atherosclerosis e. high; low; hypertension
Our agricultural populations are maintained artificially. This means that
A. mutation must be stopped. B. random mating is prohibited. C. gene frequencies are allowed to change. D. asexual reproduction must be prohibited.
An immunoassay was developed to rapidly diagnose patients infected with an emerging virus. However, the researchers discovered that some individuals were producing false negatives when tested, despite being infected with the virus. What might explain this?
A. number of genome copies carried in each virion B. rapid evolution of the viral antigen C. changes in the length of the viral DNA D. changes in the antibody produced by the virus