CHEDDER CHEESE: Pasteurised Milk, Salt, Starter Cultures, Non-Animal Rennet, Non Animal Lipase. HAM SLICE: Pork, WAter, Acidity Regulators (326, 262), Salt, Emulsifer (451), Sugar, Dextrose (Maize), Antioxidant (316), Sodium Nitrite (250), Colours (Sorghum Husk Extract 160b).
Nucleotides in DNA contain four different nitrogenous bases: Thymine, Cytosine, Adenine, or Guanine. There are two groups of bases: Pyrimidines: Cytosine and Thymine each have a single six-member ring. Purines: Guanine and Adenine each have a double ring made up of a five-atom ring attached by one side to a six-atom ring. The order of nucleotides along DNA polymers encode the genetic information carried by DNA.
As we learned in Structure of Nucleic Acids, DNA and RNA are made up by sequences of nitrogen bases-pairs: adenine, thymine, guanine, and cytosine. Scientists have long understood that these nitrogen bases somehow contained the information that coded for specific amino acids.