THE 20 AMINO ACIDS STRUCTURES
*The 20 amino acids structures:
→9 of the 20 amino acids are essential amino acids for human.
Examples: Methionine, Lysine, Tryptophan, Phenylalanine, Leucine, Isoleucine, Threonine, Valine, Histidine
→These amino acids are cannot be synthesized by human cells.
→Human must be supplied these amino acids from the nutrients.
→Some of amino acids are hydrophobic that have nonpolar side chains.
Examples: Alanine, Glycine, Valine, Proline, Leucine, Isoleucine, Tryptophan, Phenylalanine, Methionine
→Some of amino acids are hydrophilic that have polar side chains.
Examples: Cysteine, Tyrosine, Threonine, Serine, Glutamine, Asparagine, Glutamic acid, Aspartic acid,
Arginine, Histidine, Lysine
→Some of the hydrophilic amino acids are acidic that charged negatively.
Examples: Glutamic acid, Aspartic acid
→Some of the hydrophilic amino acids are basic that charged positively.
Examples: Arginine, Histidine, Lysine
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