Answer:
The correct answer is "building gradients of substances across the outer cell membrane"
Step-by-step explanation:
Building gradients of substances across the outer cell membrane is a form of diffusion in which substances move across cellular membranes based on there independent gradient. This form of movement is a type of passive transport because it does not require the use of ATP for transport. The building gradients of substances across the outer cell membrane requires diffusion and does not require the use of ATP.
Movement of vesicles along cytoskeletal tracks requires individual vesicles to be transported by there respective motor proteins along the cytoskeletal tracks. These motor proteins require ATP to move these vesicles. Also, the phosphorylation of a motor protein in the cytosol requires one phosphorus molecules from ATP.
Transport of protons (H+) from low concentration in the mitochondrial matrix to high concentration in the mitochondrial intermembrane space is a description of the "hydrogen pump" that occurs in the electron transport chain. When hydrogen ion pump occurs, the hydrogen ion gets flown back through a ATP molecule.