Final answer:
Proline is an amino acid with a unique structure that causes it to create bends or kinks in the protein backbone structure. This gives proline its special role in determining the overall shape and structure of proteins.
Step-by-step explanation:
Proline is an amino acid with a unique structure and role. Unlike other amino acids, proline has an R group that is linked to the amino group, forming a ring-like structure. This ring structure gives proline its rigid shape and causes it to create bends or kinks in the protein backbone structure. This makes proline important in determining the overall shape and structure of proteins.