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.
GET.com Personal Finance 10 Cheapest Places To Live In The United States 10 Cheapest Places To Live In The United States Who says there are no affordable places left to live in the United States? Retirees and young families looking to escape the bright lights and expensive price tags of the big cities can still find refuge in America's quaint towns if they look in the right spots.