SCIENCE
VIRUS AND BACTERIA
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Spherical, rodlike, spiral
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Generally range up to 0.2um to 5um
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Smaller than cells measured in nanometers.
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None of the above
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Detailed explanation-1: -Some examples of these bacteria include Mycoplasmas (about 0.25um), Haemophilus influenzae which ranges between 0.2 and 0.3um and Mycoplasma gallicepticum which range between 200 and 300 nanometers in diameter.
Detailed explanation-2: -Most common bacteria are about 1 to 2 microns in diameter and 5 to 10 microns long. A micron is one millionth of a meter, or 1/10, 000th of a centimeter. The human eye is amazing. Still, unaided, the smallest objects our eyes can see are about 100 microns long.
Detailed explanation-3: -Thermoplasma is an example of a small (0.2 µm diameter), free-living, cell-wall-less archaeon that is found in natural environments. Many bacteria form very thin filaments. The spirochetes are one group that contains species whose cell diameters may be 0.1 µm.
Detailed explanation-4: -From several images analyzed and more than 200 bacterial cells computed, the average dimensions obtained were: length 3.71 ± 0.18 µm and wide 1.73 ± 0.04 µm.
Detailed explanation-5: -Bacteria’s size is approximately 0.5 to 3µm (1micron = 0.001 mm) and can just be seen with an optical microscope. A micron means one millionth.