Generally, an ion with a ________ positive charge and ________ size will bind most strongly to a soil particle
A) greater; smaller
B) smaller; larger
C) smaller; smaller
D) greater; larger
A
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Oxygen (O2) makes up about 21% of the Earth's atmosphere. The graph below depicts changes in atmospheric O2 levels measured between the years 1990 and 2008. During what season would you expect oxygen levels to be lowest in a single year?
A. summer B. fall C. winter D. spring
For the most part, all Enterobacteriaceae are positive for which biochemical reactions?
a. Glucose, oxidase, and catalase b. Glucose, indole, and oxidase c. Glucose, reduce nitrates to nitrites, and oxidase d. Glucose, catalase, and reduce nitrates to nitrites
Insertion sequences are
A. are discrete genetic elements bounded at both ends with inverted repeats. B. normally relatively short (700 to 1,650 bp). C. capable of transposition. D. All of the choices are correct.
Which group of Arthropods is primarily found in the marine environment?
a. Scorpions b. Planarians c. Arachnids d. Polychaetes e. Crustaceans