Which of the following chemical agents has the smell of freshly cut grass?
A) Tabun
B) Lewisite
C) Phosgene
D) Hydrogen cyanide
Answer: C) Phosgene
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Which one of the following statements about the human impact on Earth's ecology is correct?
A. Agriculture has increased abundance and distribution of some species, while decreasing abundance and distribution of other species. B. Humans commandeer as much as 25% of all photosynthetic production on land. C. More atmospheric nitrogen is converted to ammonia by humans than by the rest of nature. D. Human activities produce more carbon dioxide than do volcanoes. E. All of these statements about the human impact on Earth's ecology are correct.
The main regulator of the calcium level in the blood is
a. parathyroid hormone. b. thyroid hormone. c. thymosin. d. growth hormone. e. insulin.
Recombinant DNA
a. is crucial in genetic engineering. b. can be produced with new biological techniques. c. uses restriction enzymes for its creation. d. relies on bacterial plasmids. e. all of these
Which of the following must occur prior to the others in infecting a cell?
a. penetration. b. adsorption. c. uncoating. d. replication.