| GO:0033762 | response to glucagon | 1 | 11 | 
| GO:0044237 | cellular metabolic process | 5 | 117 | 
| GO:0016020 | membrane | 90 | 1681 | 
| GO:0044281 | small molecule metabolic process | 58 | 1211 | 
| GO:0005634 | nucleus | 136 | 4559 | 
| GO:0005739 | mitochondrion | 28 | 998 | 
| GO:0005506 | iron ion binding | 4 | 105 | 
| GO:0005743 | mitochondrial inner membrane | 8 | 277 | 
| GO:0045155 | electron transporter, transferring electrons from CoQH2-cytochrome c reductase complex and cytochrome c oxidase complex activity | 1 | 2 | 
| GO:0016021 | integral component of membrane | 27 | 1982 | 
| GO:0070469 | respiratory chain | 1 | 5 | 
| GO:0020037 | heme binding | 2 | 93 | 
| GO:0022904 | respiratory electron transport chain | 1 | 85 |