The polypeptide chains in alpha-keratins
A) consist of long sections of alpha-helices.
B) are sometimes twisted together to form rope-like structures.
C) are held in a protein matrix by many disulfide bridges.
D) All of the above are true.
E) Only two of the above are true.

Question

Quizplus · Accepted Answer

The polypeptide chains in alpha-keratins consist of long sections of alpha-helices, which are sometimes twisted together to form rope-like structures. These chains are held in a protein matrix by many disulfide bridges. Therefore, all three statements in options A, B, and C are true. Therefore, option D is the correct answer.

The Polypeptide Chains in Alpha-Keratins