Most fibrous proteins like keratin have a secondary structure of alpha-helices. Which fibrous protein is an exception, consisting of three polypeptide chains?
Q1. Most fibrous proteins like keratin have a secondary structure of alpha-helices. Which fibrous protein is an exception, consisting of three polypeptide chains?
Answer: Collagen
Explanation: Collagen is a fibrous protein but exists as a triple helix, unlike the standard alpha-helix. Hemoglobin is tempting but it is a globular protein.