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.
Wanna live somewhere cheap? One particular region has your back. The most affordable places to live in the U.S. based on housing, commuting and utilities costs are mostly cities in the midwest. The picks come from a new Trulia study that found America's most affordable cities based on a few key pieces of information.