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.
While the monosaccharide and phosphate group alternate in sequence and form the backbone of the DNA double helix, the nitrogenous bases may differ in every adjoining nucleotide. The four nitrogenous bases present in DNA are adenine (A), guanine (G), cytosine (C) and thymine (T). In RNA, the only differing nitrogenous base is uracil (U) (which replaces thymine in DNA and differs thymine only by the missing methyl group at carbon 5 of the pyrimidine ring). Of the nitrogenous bases, adenine and guanine are purines, which are aromatic compounds attached to an imidazole group, while cytosine and thymine and uracil compose a set of pyrimidines, which are one ring-aromatic compounds.