QUESTIONS:

1. How do plants use oxygen? How do animals use oxygen? How do plants release oxygen, and what is made in the process?

2. How do plants benefit animals biochemically, other than as a source of high-free-energy foods?

3. What probably would happen to the Earth and animal life on it, if all plants were to disappear?

4. Where do plants get the energy required to synthesize glucose? What do they do with the glucose?

5. What is the structural distinction between procaryotes and eucaryotes? Which life form developed earlier? Which are we?

6. Where are respiration and photosynthesis carried out in procaryotes and eucaryotes?

7. When a mole of glucose is burned, how can the free energy available for driving other processes be 686 kcal, when only 673 kcal of heat are produced? Where do the extra 13 kcal come from?

8. Why do living organisms break glucose down in small steps rather than extracting all 686 kcal at once?

9. Of the 686 kcal of free energy available from a mole of glucose, how many kilocalories are saved by an oxygen-breathing organism? How are they saved? How many kilocalories per mole of glucose are saved by a yeast cell living under anaerobic conditions?

10. What are the intermediate molecules to which energy is transferred prior to the synthesis of ATP? What happens to these intermediate molecules? Why are they not used up and constantly in need of replacement? What are the compounds that we need from outside to make these energy carriers called? Why do we need them only in small amounts?