Match the following terms and definitions. 1. assimilation
process that involves the second step in the chemical breakdown of glucose; converting pyruvic acid into carbon dioxide
2. cellular respiration
occurring in the presence of oxygen
3. Krebs cycle
a series of chemical reactions that break down sugars and produce energy
4. electron transport chain
occurring in the absence of oxygen
5. aerobic
process that involves the third step in the chemical breakdown of glucose; transferring electrons to form ATP
6. anaerobic