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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.
Section 3 - Photosynthesis. The sun is the source of energy for most living things. All cells need energy to carry out their functions. The process by which a cell captures the energy in sunlight and uses it to make food is called photosynthesis.Nearly all living things obtain energy either directly or indirectly from the energy of sunlight captured during photosynthesis.hen your cells need energy, they make a withdrawal by breaking down the carbohydrates in food to release energy. The process by which cells obtain energy from glucose (a type of sugar) is called respiration. During respiration, cells break down simple food molecules such as sugar and release the energy they contain.