1. Name the molecules that serves as the universal energy currency of cells. Describe or depicted the cycle of this molecules and which steps in this cycle release energy and which steps requires energy. In general term describe what happen to molecules (chemically) that results in a release or energy?

2. An enzyme is most commonly what type of bio molecule? what is the function of an enzyme? In term of energy, how does an enzyme accomplish this function?

3. Which metabolic pathway produces the most NADH and FADH2 that feed into the electron transport chain? As electrons from NADH and FADH2 are transported along the ETC, what happen to H+ ions within the mitochondrial matrix? How is H+ ions essentials for ATP generation?

4. Living organism require a continuous input of energy. List the 3 major function which cells/ organism require energy

5. Define the "coupling of chemical reactions" within the cell. Do reaction that need to be coupled typically require energy input or release energy? To what molecules are reaction usually coupled?