A myosin molecule in the thick filaments can be considered a protein having a quaternary structural level.Which of the following best describes this structural level?
A) Myosin molecules consist of two heavy and to light polypeptide chains.
B) Myosin has an ATP binding site, actin binding site and flexible hinge region.
C) Myosin is a primary component within a myofibril.
D) Myosin is involved in the power stroke of muscle contraction.

Question

Quizplus · Accepted Answer

The quaternary structural level describes the arrangement of multiple protein subunits to form a larger protein complex. Myosin molecules consist of two heavy and two light polypeptide chains arranged in a specific 3D structure, which is the quaternary structure of the protein. Therefore, choice A is the best answer. Choices B, C, and D describe other aspects of myosin structure and function, but they do not specifically address the quaternary structure.

A Myosin Molecule in the Thick Filaments Can Be Considered