Question

19. How are motor proteins, such as kinesin and dynein, able to “walk” on cytoskeletal fibers? A. Their protein structure converts chemical energy stored in ATP into mechanical energy that exerts a force on the fiber. B. They are pulled along the fibers by various cellular contractions. C. The instability of microtubules, growing and shrinking, exerts a force on motor proteins. D. Their cargo, be it a vesicle or another protein, is sufficiently heavy that it pulls the motor in a directional manner. E. Proteins can do that which seems impossible