Seafood -- including clams, trout, salmon, sardines, haddock and oysters -- are a rich source of B12. Clam mollusks contain 84.1 micrograms and oysters contain 13.3 micrograms per 3 ounces. Vitamin B12 is also found in cod, catfish, crab and swordfish. Consume milk, cheese and yogurt to increase your daily B12 intake.eady-to-eat breakfast cereals are an excellent source of B12 and folic acid. Folic acid is also added to rice, egg noodles, bread, pasta, corn meals, orange drinks and tomato juice. Tomato juice provides 10 percent of the daily value per 6 ounces and egg noodles provide 15 percent of folic acid in 1/2 cup.
If it was one DNA letter for one amino acid then you could only code for a maximum of four amino acids. Two letters in every possible combination could code for up to sixteen amino acids. Still, not enough. But three DNA letters provide more than enough combinations to code for all twenty amino acids.
Report Abuse. Amino acids are the building blocks of protein. Twenty amino acids are needed to build the various proteins used in the growth, repair, and maintenance of body tissues.Eleven of these amino acids can be made by the body itself, while the other nine (called essential amino acids) must come from the diet.eport Abuse. Amino acids are the building blocks of protein. Twenty amino acids are needed to build the various proteins used in the growth, repair, and maintenance of body tissues.