... and peptide bonds in a light blue colour. P Within the nucleus of the human body cell is 46 chromosomes containing hereditary material, some from your mother and some from your father, each chromosome is one DNA molecule. Along this strand of DNA is many genes, all coding for one polypeptide chain. DNA is made up of many neucleotides, these are in turn made up of smaller components, one neucleotide is made up of a pentose sugar, (the pentagon shape) a carbon base (rectangle shape) and a phosphate molecule (shown in the diagram as a circle). Three neucleotides form one codon, and this is how the DNA is 'read', in codons, each of theses codons can code for a specific amino acid. It is important that they are in triplets, because if it was just a single neucleotide there would only be four different codings as there are only four bases. ...

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