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What makes some amino acids polar and nonpolar?

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Amino acids can be classified according to their side chain's chemical properties (the R-group). ... Why are non-polar molecules hydrophobic? ... read more

That means, if whether an amino acid is called ‘polar’ or ‘non-polar’ refers to the nature of the sidechain, not the entire amino acid. To bottom panel shows the hydrophobic. Remember, both the charged (top) an polar uncharged (purple, middle left) are polar. read more

There are basically four different classes of amino acids determined by different side chains: (1) non-polar and neutral, (2) polar and neutral, (3) acidic and polar, (4) basic and polar. Principles of Polarity: The greater the electronegativity difference between atoms in a bond, the more polar the bond. read more

Non Polar Amino Acids have equal number of amino and carboxyl groups and are neutral. These amino acids are hydrophobic and have no charge on the 'R' group. The amino acids in this group are alanine, valine, leucine, isoleucine, phenyl alanine, glycine, tryptophan, methionine and proline. read more

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