All living things need nitrogen. How does nitrogen enter the living portion of an ecosystem?
A) Atmospheric N2 taken in by photosynthesis
B) Atmospheric N2 taken in by soil bacteria
C) Elemental nitrogen taken in by plant roots
D) Elemental nitrogen taken in by plant leaves
B
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Which of the following microscope types would be least useful in viewing unstained living cells?
A. Phase contrast B. Interference C. Bright-field D. Dark-field
Viruses
A. consist of only a single cell. B. consist of multiple cells. C. contain ribosomes. D. contain a nucleus. E. are smaller than cells.
Which of the following devices is used for PCR?
A) an electrophoresis chamber B) a gene gun C) a DNA sequencer D) a thermocycler E) a nucleic acid synthesis machine
In what type of environment would you be most likely to find anaerobes?
A) high temperature B) high salt content C) high acidity D) no oxygen