KEY TAKEAWAYS •
There are hundreds of possible amino acids but only twenty seen in the proteins seen in nature.
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Amino acids are zwitterions at physiological pH values but can be neutral, basic, or acidic when it comes to the amino acid R side chains.
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The isoelectronic point is the point at which the amino acid is considered neutral in charge. It is based on the pKa of the different side chains.
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Proteins are groups of amino acids that make amide bonds between the amino acids.
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There are primary, secondary, tertiary, and quaternary structures with regard to proteins.
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