Writing Meters Liters and Grams Answer Key.47: A Guide to Measuring Length in the Metric System

To simplify things, very large and very small objects are expressed as multiples of ten of the base unit. For example, rather than saying that the Nile River is 6,650,000 meters long, we can say that it is 6,650 thousand-meters long. This would be done by adding the prefix "kilo" (meaning 1,000) to the base unit "meter" to give us 6,650 kilometers for the length of the Nile River. This is much simpler than the American system of measurement, in which we have to remember inches, feet, miles, and many more units of measurement. Metric prefixes can be used with any base unit. For example, a kilometer is 1,000 meters, a kilogram is 1,000 grams, and a kiloliter is 1,000 liters. Six common prefixes used in the metric system are listed below.

writing meters liters and grams answer key.47

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Write it all on paper, including the units. The unwanted units should cancel out, leaving you with the units you want. Many students want to reach for the calculator first, without writing out the equation; often, this leads to the wrong answer.

When you visualize protein on an SDS-PAGE gel, you need to load the appropriate mass of protein (micrograms) in order to make your gel turn out right. Since you're measuring out the protein sample with a micropipet (in microliters), you'll need to convert from mass to volume, using the protein concentration. For an explanation of how to do this, see calculations for protein gel loading.

You're given an amount in micrograms and you need to convert that to microliters. To do the conversion, you need to know the relationship between micrograms and microliters; this is the concentration of your starting DNA solution in μg/μl. Before you think about the numbers, write down the equation with the appropriate units:

This gives you an answer in terms of enzyme units, but you need to know how many microliters to pipet. If you factor in the enzyme concentration (50,000 Units/ml in this example) and a conversion factor from milliliters to microliters, you get this: 2ff7e9595c