Cells undergo metabolic processes to generate needed energy to carry out all cellular functions. The common cellular energy produced by mitochondrion is called the ___ molecule. When the production of energy occurs in the presence of oxygen, it is called the_____ respiration. When the process occurs in a low oxygen condition, it is called the is ____ Both processes start with the main reactant ____ molecule undergoing_____to produce pyruvates. The major different between the outcomes of these two different cellular processes is the amount of energy produced. Cellular respiration releases ____ gas molecule as a byproduct.