For oxygen to diffue into a metabolically active eularyotic cell.
_(_())_(_()) The cell must expend energy to trampert ompen into a cell.
? Transport probeirs are required to allow ovygen inte a cell, because onpen is a hydrophilic maleside.
? Kinetic energy must be present.
? A.P is required to activate tramport proteins.
_(_())_(_()) Oxygen mant go against its concentration gradient into the cell.