They are mostly chiral which means that they will rotate plane polarised light as they form to enatiometers which are nonsuperimposable mirror images of one another.The results is optically inactive as it will be a racemic mixture of the 2 isomers.
They are able have very high melting points because they are able to transfer electrons around the molecule to forma zwitterion ( an ion with two opposite charges , but has no overall charge) this leads to the formation of very strong ionic forces leading to the high metlting temperature.
With Nihydrin and a little heating amino acids chage colour to form purple/blue spots on a thin layar chromotography sample sheet. Amino acids are the monomers of protiens whichare long chains of polypepetide which may have further layers of organisation such as secondary beta pleated sheets or alpha helixes , 3D structure in the form of tertiary structure and quarternanry structure which is the formation of complexed proteins which have more than one chain of amino aicds in tertiary structure.
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