Final answer:
Hemoglobin is a protein composed of 4 polypeptide chains with uniform L-configuration amino acids, except for cysteine which has R-configuration.
Step-by-step explanation:
Hemoglobin is a globular protein composed of four polypeptide chains. Two chains are called alpha (α) and the other two are called beta (ß). Each alpha chain has 141 amino acids, while each beta chain has 146 amino acids. The amino acids in hemoglobin (and any protein) have a uniform L-configuration, with the exception of cysteine (Cys), which has an R-configuration.