The sequence of bases on DNA codes for the sequence of amino acids in proteins. But there are 20 different amino acids and only 4 different bases, so the bases are read in groups of 3. This gives 64 combinations, more than enough to code for 20 amino acids.
10 cheapest places to live in the U.S. Ashland, Ohio, ranks as the 10th most affordable city in the U.S., according to the Council for Community and Economic Research. Ashland has a cost of living index of 87.6.
The council crunched more than 50,000 prices for everything from grocery items to transportation to housing to come up with their Cost of Living Index. The national average is 100. Following is a look at each of the 10 most affordable cities in the United States. 10 cheapest places to live in the U.S. For three straight years, Harlingen, Texas, has ranked as America's most affordable city. Its cost of living index of 81.8 in 2012 fell 0.6 from the previous year.