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The smaller building blocks of protein are called amino acids. Amino acids are molecules containing a carboxyl group (-COOH), an amino group (-NH2) and a variable or "R" group, which is what makes the different types of amino acids. There are 20 different amino acids, but they can be arranged into many different sequences, which explains why so many different proteins exist. Amino acids form long chains called polypeptide chains. These chains can then fold into a secondary structure, either an alpha helix or a beta pleated sheet. Then that continues to be folded into the tertiary structure, which is formed by four different types of bonds: hydrogen bonds, hydrophobic interactions, ionic bonding and disulfide bridges. Tertiary folding can have two shapes, coils or barrels. Finally there is quaternary structure, which contains multiple polypeptide chains folded into rounded shapes. Quaternary structure has two different shapes, fibrous and globular.

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Eino Rolfson

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3y ago

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