Combustion of glucose in a flame contrary to harvesting the energy from glucose in a biological cell:
• Glucose (sugar ) is made out of ,carbon, hydrogen an oxygen., When exposed through a fire (combustion) , the heat results in those atoms combining with the oxygen in the air and, turn into liquid, and releases CO2. (exothermic reactio)
• On the contrary; ,the energy can be harvested from glucose in a biological cell through, cellular respiration. ,whereby, ,glucose is reduced to provide energy in the form of ATP and heat,. (endorthermic reaction )