Identify a Polar and Hydrophilic Amino Acid

Proteins are essential biological molecules that play critical roles in various cellular functions. They are composed of amino acids, which are linked together by peptide bonds. Each protein has a unique sequence of amino acids that determines its structure and function. Among the 20 different amino acids, some are classified as polar, nonpolar, charged, or special case amino acids. Understanding the classification of amino acids is fundamental in biochemistry.

Which of the following amino acids is classified as polar and hydrophilic?