12: Respiration Last updated Sep 8, 2021 Save as PDF 11.1.E: Photosynthesis (Exercises) 12.1: How Cells Obtain Energy Page ID65173 ( \newcommand{\kernel}{\mathrm{null}\,}\) 12.1: How Cells Obtain Energy12.1.1: Glycolysis12.1.2: Citric Acid Cycle and Oxidative Phosphorylation12.1.3: Fermentation12.1.4: Connections to Other Metabolic Pathways12.1.E: How Cells Obtain Energy (Exercises)12.2: Cellular Respiration Overview Thumbnail: Adenosine triphosphate. (Image by FreeCliparts from Pixabay).