Nitrogen fixation results in the
A) loss of biologically available N from an ecosystem.
B) formation of nitrogen gas.
C) direct formation of nitrate.
D) addition of biologically available N to an ecosystem.
Answer: D
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Indirect EIA is used to detect
A) antigens. B) antibodies. C) viruses. D) serum.
The unknown bacterium that you are testing makes the enzyme phenyalanine deaminase, as indicated by the results of a phenylalanine test. This enzyme facilitates the removal of a/an ______ group from the organic compound so it can be converted into an intermediate compound for the Krebs cycle.
A. phosphate B. carboxyl C. amino D. hydroxyl
If a human gene containing introns is inserted into a prokaryote cell, a(n) functional human protein will be produced
__________________ Indicate whether the statement is true or false.
A pond represents a(n) ________, while the minnows represent a(n) ________.
A. community; population B. ecosystem; population C. population; ecosystem D. ecosystem; community E. population; community