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

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

blues · Answer

Process of elimination is a reasonable way to approach problems like this. Eliminate the ones it plainly can't be and we'll go from there.

anonymous · Answer

I think it's A