In the lac operon in E. coli, a nonsense mutation in the ________ gene will result in a loss of ß-galactosidase activity in the cell
A) lacZ
B) lacI
C) lacY
D) Both A and B
E) All of these
A
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Hypoglycemia, or low levels of glucose in the blood of a healthy human, is "corrected" by a(n) _____
A) increase in the secretion of insulin B) increase in the secretion of glucagon C) increase in the secretion of both insulin and glucagon D) decrease in the secretion of both insulin and glucagon E) increase in the secretion of thyroid hormones
Which process results in the development of progeny from an unfertilized gamete?
a. budding b. fragmentation c. fission d. parthenogenesis
Freshwater is most likely to be polluted
A) by oil spills in ocean water moving inland. B) as a result of eutrophication. C) by contaminants from aquifers moving to surface waters. D) from organic solvents and farming chemicals in surface water runoff. E) by radioactive waste seeping from nuclear reactors.
The zone of inhibition that is formed during the disc diffusion susceptibility test is dependent on many factors. Which of the following choices is not one of the factors discussed that the zone of inhibition is dependent on?
A) The molecular weight of the antimicrobic. B) The pH of the antimicrobic. C) The type of media. D) The concentration of the bacterial culture.