Question

question 15
a small molecule about the size of atp is injected into a cell and observed in the nucleus a short time later. what type of transport has taken place?
osmosis
diffusion
atp - mediated transport across the nuclear pore.

Explanation:

ATP is a relatively large molecule. Movement of molecules from an area of lower concentration to an area of higher concentration (as is likely the case from the cell - cytoplasm to the nucleus for ATP) against a concentration gradient requires energy and is an active - transport process. ATP - mediated transport across the nuclear pore is an example of active transport. Osmosis is the movement of water, and diffusion is the passive movement of substances down a concentration gradient.

Answer:

ATP - mediated transport across the nuclear pore