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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
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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.
I think it's A
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