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.
America's Most Affordable Cities In 2015. Every day in coastal hot spots like San Francisco, New York, and Boston, it seems the news on housing costs is just abysmal. Professionals in these areas may earn higher paychecks, but many struggle with high rentsâand for many, buying a house seems like an impossible dream.