The locations of molecules A and B at the beginning of the experiment are shown. Which statement best describes what was observed when the setup was examined 20 minutes later?
1. Molecule A remained inside the artificial cell and molecule B remained outside. 2. Only molecule A was found both inside and outside the artificial cell.
3. Only molecule B was found both inside and outside the artificial cell.
4. Both molecules A and B were found inside and outside the artificial cell.