Decompression sickness ("the bends") is caused by
a. a rapid rise of carbon dioxide in the blood.
b. lack of oxygen in the tissues.
c. bubbles of nitrogen in the blood.
d. glucose deficiency.
e. descending too rapidly into deep water.
Ans: c. bubbles of nitrogen in the blood.
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The total magnification achieved in the laboratory when using the oil immersion objective of the compound light microscope is:
A) 40×. B) 100×. C) 400×. D) 1,000×.
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
How do scientists estimate the atmospheric levels of carbon dioxide that existed on Earth hundreds or thousands of years ago?
A) They deduce it from the carbon dioxide content of fossil fuels. B) They measure it from bubbles of gas trapped in Antarctic ice. C) They estimate it from the relative numbers of carbon-based life forms that existed over time. D) They measure it from erupting volcanoes, bubbling hot springs, and seeping hydrothermal vents.
Answer the following questions true (T) or false (F)
1. The endospore stain reveals internal structures within cells of the genera Bacillus and Clostridium. 2. Acid-fast cells such as Mycobacterium lose the color of the primary stain in the presence of hydrochloric acid. 3. Three-dimensional images of specimens can be obtained using scanning electron microscopes.