The purpose of this image was to promote
1.a sleep aid for soldiers
2.information from a war zone
3.newly discovered antibiotics
4.none of the choices
3
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Which of the following is a phototroph?
A) a tree B) a mushroom C) bacteria growing on decomposing matter D) an earthworm E) a person
Eutrophication can be caused by excess accumulation of in a body of water.
A. phosphorus B. nitrogen or phosphorous C. carbon D. nitrogen or carbon E. nitrogen
Which of the following types of mutation may play an important role in driving evolution because they are often nonlethal and, therefore, remain in the gene pool?
A. Frameshift B. Nonsense C. Missense D. Deletion
Penicillin was considered a "miracle drug" for all of the following reasons EXCEPT
A) it was the first antibiotic. B) it does not affect eukaryotic cells. C) it inhibits gram-positive cell wall synthesis. D) it has selective toxicity. E) it kills bacteria.