Calculating the size of an organism using a scale bar
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The document explains how to use a scale bar to calculate the actual size of microorganisms. It provides instructions to measure the length of a protist called Oxytricha trifallax using a ruler, as well as the length of the scale bar. The measurement of the protist is then multiplied by the number on the scale bar to determine the actual size in micrometers, taking into account the conversion between micrometers and millimeters.
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Calculating the size of an organism using a scale bar
- 1. Calculating the size of an organism using a scale bar How do you know the size of a microorganism? You will notice that many pictures of microorganisms have a scale bar. A scale bar is a very useful tool that allows us to calculate the actual size of objects. Follow the instructions below to figure out the length of this Oxytricha trifallax protist. INSTRUCTIONS: a) Measure the length of Oxytricha trifallax using your ruler. (Express your answer in mm.) b) Measure the lengthof the scale bar withyour ruler.(Expressyouranswerinmm.) c) To findthe actual size of the organisms,take youranswerandmultiplyitbythe numberonthe scale bar.The unitsonthe scale bar are inμm and so youranswermust be in μm. Howbig isOxytrichatrifallax? d) How manyμm are there ina mm? e) Howmany Oxytrichatrifallaxcouldlie endtoendin1 mm?