Certain researchers have published peer-reviewed reports that the use of zinc lozenges reduces the length and severity of cold symptoms. Why are some scientists still skeptical about the merits of using zinc lozenges during a cold?
A) Most people get zinc in their diet so extra zinc lozenges may not affect a cold.
B) Ideas about vitamin C have been discredited, so zinc will also be ineffective.
C) There is no way of knowing if the original work was properly controlled.
D) There may be other reasons why the people taking zinc lozenges recovered faster.
D
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A. population B. organism C. biosphere D. ecosystem E. macromolecular community
A eukaryotic cell that has had a prokaryotic gene inserted is called
A. a genetically engineered cell. B. a GMO. C. a genetic recombinant. D. All of the choices are correct.
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What will be an ideal response?
Which process underlies the thigmotropic behavior of a green bean tendril?
A) rotation of the tendril in response to photoperiod B) rotation of the tendril in response to a biological clock C) extra proliferation of cells on the shaded side of the tendril D) slower growth on the side where an object is touching the tendril