Researchers Tried to Explain How Vesicular Transport Occurs in Cells

Multiple Choice

Researchers tried to explain how vesicular transport occurs in cells by attempting to assemble the transport components. They set up microtubular tracks along which vesicles could be transported, and they added vesicles and ATP (because they knew the transport process requires energy) . Yet, when they put everything together, there was no movement or transport of vesicles. What were they missing?

A) an axon
B) contractile microfilaments
C) endoplasmic reticulum
D) motor proteins