Week 2 TMW.docx - microbiology 3b homework Chapter 4 Why do...

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microbiology 3b homework Chapter 4 Why do scientist use metric rather than English units? This is due to the precision of the measurements in the metric system. Since microorganisms are so small that English units are not comparable to get accurate measurements. Metric units use a decimal system, with each unit being one tenth the size of the next larger unit. These units of measurements can useful to use to measure microorganism as the size of cells are approximately a nanometer, one thousandth of a micrometer. Why is magnification high and color absent in an unretouched electron micrograph? This because electrons travelling waves have wavelengths between .01 and.001 nm. This outside the scope of visible light with the shortest visible radiation (violet) having a wavelength of 400 nm. Pseudomonas aeruginosa Is a gram negative, rod shaped bacterium that is naturally fluorescent. It is a disease- causing agent that is associated with serious illness such as pneumonia.
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