BIOLOGY

2. Krebs cycle after this first intermediate.
6. The final step of the pathway.
8. Third stage of aerobic respiration, in which also occurs in the mitochondria.
13. They use oxygen.
15. Breack down the pyruvate products of glycolysis.
16. They occur in the absence of oxygen.
18. Stores oxygen in muscle tissue.
19. Fermentation and aerobic respiration begin with the same reaction in the cytoplasm.
20. An organic molecule with a three-carbon backbone.

1. Digests lactose in milk.
3. Carry energy that can be used to drive endergonic reactions.
4. Direct transfers of a phosphate group from a substrate to ADP.
5. To build proteins or other molecules.
7. The main pathway by which cells harvest energy from organic molecules.
9. Electron and hydrogen ions are traslated from NADH directly to pyruvate.
10. Pyruvate becomes converted to ethyl alcohol, or ethanol.
11. Molecule becomes reduces when it receives electrons.
12. Its only regenerated in the final steps of fermentation.
14. Bacteria and single celled protists.
17. The formation of many reduced coenzymes that drive the third and final stage of aerobic respiration.