Refer to the paragraph on the effects of estrogens in the environment. You are assigned to write the report to the Environmental Protection Agency, which needs to decide what level of 17?-estradiol to permit in sewage output
You do not want to make the level any lower than necessary, because it requires substantial additional money for the extra treatment of sewage. Given the data presented above, what level of 17?-estradiol would you suggest is safe to prevent feminization of fish? A) 2.5 ng/l
B) 12.5 ng/l
C) 25 ng/l
D) 100 ng/l
C
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__________ are an ancient fungal group and the only fungi with flagellated spores and gametes. Fill in the blank(s) with the appropriate word(s)
A reaction of a strong acid and a strong base will produce water and
a. a buffer. b. a salt. c. gas. d. solid precipitate. e. solute.
Which species is most likely to become extinct?
A) The jack-in-the-pulpit, found throughout the eastern United States and Canada B) The northeastern pygmy shrew, found throughout New Jersey and Pennsylvania C) The white tiger beetle, found throughout several mid-Atlantic U.S. states D) Kirtland's warbler, which breeds in only a small area of Michigan E) Carp, found throughout Europe, the United States, and Canada
The ribosome is important for catalyzing the formation of peptide bonds. Which of the following statements is true?
(a) The number of rRNA molecules that make up a ribosome greatly exceeds the number of protein molecules found in the ribosome. (b) The large subunit of the ribosome is important for binding to the mRNA. (c) The catalytic site for peptide bond formation is formed primarily from an rRNA. (d) Once the large and small subunits of the ribosome assemble, they will not separate from each other until degraded by the proteasome.