Osmosis and diffusion are both examples of passive transport, neither of which requires energy to cross the cell membrane from areas of high concentration to areas of low concentration. Active transport is the process of moving molecules and ions from areas of low concentration to areas of high concentration. Active transport requires energy in the form of ATP.
Active transport is mostly likely occurring if energy is needed to move materials into or out the cell.
Active transport requires an expenditure of energy to transport materials from one side of the membrane to the other against a concentration gradient and is limited by the number of transporter proteins present.
That is to say, it is a transport that is carried out against the gradient, be it concentration or electrical and, consequently, energy expenditure in the form of ATP will be required.
Therefore, we can conclude that active transport is mostly likely occurring if energy is needed to move materials into or out the cell.
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