These 10 animal facts will amaze you. The face of farming and agriculture has changed drastically over the past 100 years. At the beginning of the 20th century, over 70% of the population of the United States lived and worked on farms, but by 2008, the figure had dropped to less that 3%.
During this process, glucose from food is broken down into carbon dioxide and water, and energy is released. The process of releasing energy from food is called respiration, or cellular respiration as it is a series of steps that take place within living cells. It is important to not confuse respiration, or oxidizing glucose, with breathing.
ATP is consumed in glycolysis to convert glucose to pyruvate, and produced in electron transport chain. Cellular respiration consists of three parts in order: glycolysis, Krebs cycle, and electron transport chain. Glycolysis involves total of 10 steps. Out of those, step 1 and 3 use ATP. In step 1, hexokinase (HK) take a phosphate from ATP and add the phosphate to glucose to create glucose-6-phosphate. Because a phosphate is taken out, ATP becomes ADP. In step 3, phosphofructokinase (PFK) take a phosphate from ATP and add the phosphate to fructose-6-phosphate to create fructose-1,6-bisphosphate. Electron transport chain consists of many steps as well. Out of those, the last step produces ATP.