All animals are eukaryotic, multicellular organisms with cell walls surrounding their cells
a. True
b. False
ANSWER: False
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Denitrification ____
a. converts ammonium to nitrates b. reduces nitrates to nitrites c. reduces ammonia to ammonium d. converts atmospheric nitrogen to ammonia e. converts nitrates to nitrogen gas
One feature of "engineered" plasmids that is helpful in the isolation and analysis of cloned DNA is:
a. they can only handle DNA fragments of up to 10 kb. b. that they are an integral part of all eukaryotic cells. c. they contain no genetic material of their own so that the cloned fragment is truly isolated. d. the presence of genes that allow transformed cells to survive on different media. e. the base sequence of one strand reads the same asits complement
In subarctic saltmarshes, scientists have found that the addition of calcium has no effect on productivity, but additional iron does increase productivity. In this example, iron
A. is a limiting factor. B. biomagnifies in the marsh plants. C. is a precursor to calcium. D. stimulates evapotranspiration. E. blocks the effect of calcium.
You are studying a cell structure that is approximately 100 nm in size. Which of the following provides the greatest magnification you can use to see this structure?
A) brightfield microscope B) darkfield microscope C) transmission electron microscope D) phase-contrast microscope E) scanning electron microscope