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.
There are two classes of nitrogen bases called purines (double-ringed structures) and pyrimidines (single-ringed structures). The four bases in DNA's alphabet are: 1  adenine (A) - a purine. 2  cytosine(C) - a pyrimidine.