Amino acids, as their name suggest, contain an group and an group.
Glycine, simplest of all amino acids
Different amino acids have a different group of atoms sticking out of the top. In glycine there is just one atom in this group, a single atom.
More than 100 amino acids occur in bacteria and plants, but only about 20 are commonly found in most animal proteins.
A more complex amino acid, tyrosine
On the left you can still see the amino and acid groups, but instead of ís single hydrogen atom, tyrosine has a larger group of atoms (shown on right).
Each of the 20 common amino acids has a different group of atoms attached to the amino and acid backbone.
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