What is a polar and non-polar alkyl group in amino acids?

All amino acids are polar because all of them contain carboxylic acid and amino functional groups. read more

Polar pretty much means the other amino acids with places for solvation by water molecules through mostly hydrogen bonding. This would include such examples as tryptophan, glutamic acid, asparagine, and proline. read more

NON-POLAR. Alanine, Cysteine, Glycine, Isoleucine, Leucine, Methionine, Phenylalanine, Proline, Tryptophan, Valine. Their R-groups will be pure hydrocarbon alkyl groups (alkane branches) or aromatic (benzene rings; the exception to this is the aromatic amino acid Tyrosine, which is polar). read more

Amino acids have a two carbon bond. One of the carbon is part of a group called the carboxyl (COO-). A carboxyl group is made up of one carbon (C) and two oxygen (O) atoms. That carboxyl group has a negative charge, since it is a carboxylic acid (-COOH) that has lost its hydrogen (H) atom. The second carbon is connected to the amino group This is a dehydration synthesis reaction (also known as a condensation reaction), and usually occurs between amino acids. read more