1. The main products formed during aerobic cellular respiration are energy, a. oxygen and water. b. oxygen and carbon dioxide. c. water and carbon dioxide. d. sugar and oxygen. e. sugar and carbon dioxide.

c. water and carbon dioxide

2. The largest number of ATP molecules are produced in which part of the respiration reaction? a. glycolysis b. transition reaction c. Kreb’s cycle (citric acid cycle) d. Electron transport system (chain)

3. The order of the major pathways and reactions of aerobic cellular respiration is a. glycolysis – transition reaction – citric acid cycle – electron transport system. b. electron transport system – glycolysis – transition reaction – citric acid cycle. c. glycolysis – electron transport system – transition reaction - citric acid cycle. d. citric acid cycle – glycolysis – electron transport system – transition reaction.

a. glycolysis – transition reaction – citric acid cycle – electron transport system.

4. The main reason why organisms would use fermentation is a. lack of oxygen. b. lack of enzymes. c. it produces the greatest amount of ATP. d. lack of carbon dioxide.

a. lack of oxygen