This is the variable radical group and is different for every amino acid. The second one is a carboxyl group -OOOH.This atom is surrounded by three chemical groups.All amino acids contain a carbon atom in the middle of the molecule, the alpha-carbon.Although all these have varied structures, the basic structure of amino acid remains uniform. These twenty acids will be our focus here. But only about 20 amino acids form a part of the proteins in the human body. There are actually thousands of amino acids occurring in nature. You can download Biomolecules Cheat Sheet PDF by clicking on Download Button Below These are an essential nutrient in our diet because of the functions they perform. This enables the great diversity of proteins that can be found in nature. Amino acid being organic compound molecules can form various different links with each other due to the versatile nature of carbon. These amino acids bond together to form a larger protein molecule. There are some 20 amino acids in the proteins that we consume.
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