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A: Cells use energy in order to grow, regulate metabolism and reproduce. This energy is obtained from a source such as food molecules or light from the sun, and through processes like glycolysis, the citric acid cycle and oxidative phosphorylation, an energy-rich molecule is then created.
What is it called when cells use energy to move molecules? The answer you are looking for is 'active transport'.    Here the cell moves the molecule into (or out of) the cell against  the concentration gradient. This requires â¦energy.    There are other energetic process such as endo- and exo-cytosis  that the cell uses to move large molecules.