| Term | Definition |
| mitochondria | an organelle in eukaryotic cells that serves as the site of cellular respiration |
| chloroplast | an organelle found in plants and photosynthetic protists that absorbs sunlight and usues it to drive the synthesis of organic compounds from carbon dioxide and water |
| peroxisome | an organelle containing enzymes that transfer hydrogen (H2) from various substrates to oxygen (O2), prouducing and then degrading hydrogen peroxide (H2O2) |
| cristae | an infolding of the inner membrane of a mitochondrion that houses electron transport chains and molecules of the enzyme catalyzing the synthesis of ATP |
| Mitochondrial Matrix | the compartment of the mitochondrion enclosed by the inner membrane and containing enzymes and substrates for the citric acid cycle |
| plastid | one of a family of closely related organelles that includes chloroplasts, chromoplasts, and amyloplasts. They are found in cells of photosynthetic organisms. |
| thylakoid | a flattened membranous sac inside a chloroplast. they exist in an interconnected system in the chloroplast and contain the molecular "machinery" used to convert light energy to chemical energy |
| granum | a stack of membrane-bounded thylakoids in the chloroplasts. they function in the light reaction of photosynthesis. |
| stroma | within the chloroplast, the dense fluid of the chloroplast surrounding the thylakoid membrane; involved in the synthesis of organic molecules from carbon dioxide and water |
| glyoxysomes | specialized peroxisomes found in the fat-storing tissue of plant seeds containing enzymes that initiate the conversion of fatty acids to sugar |