Identifying Amino Acids with Hydroxyl Groups

In the context of organic chemistry, biomolecules are essential for the structure and function of living organisms. One class of biomolecules is amino acids, which are the building blocks of proteins. Each amino acid has a specific structure, which includes an amino group, a carboxyl group, a hydrogen atom, and a distinctive side chain (R group) that varies among different amino acids.

Consider the following amino acids: Glycine, Alanine, Serine, and Leucine. Which of these amino acids contains a side chain that can form hydrogen bonds due to the presence of a hydroxyl (-OH) group?