Cell Respiration

1. Autotrophs (plants) make food (glucose) from sunlight. Heterotrophs cannot make their own food. How do heterotrophs get their source of glucose? 

2. The first step of cellular respiration is glycolysis.

a. Where in the cells does glycolysis take place? 

b. What happens during glycolysis? 

c. How many molecules of ATP are produced from 1 molecule of glucose at the end of glycolysis? How many molecules were used to start the process? What is the net gain of ATP molecules from 1 molecule of glucose? 

4. The Krebs cycle is the next step in cellular respiration.

a) What are the two products of the Krebs cycle?  

b) Where in the cell does the Krebs cycle occur?

5) The next stage is the electron transport system.  

a) How many molecules of ATP can be produced in the Electron transport system?

b) Where in the cell does the electron transport system take place? 

6. How many molecules of ATP are produced from 1 molecule of glucose at the end of cellular respiration?

7.  What is the process of cellular respiration called when oxygen is not present? 

Apply Your Knowledge

8. C6H12O6 + 6 O2   6 CO2 + 6 H2O + energy (ATP)

CO2 is a product of cellular respiration. How do you think humans get ride of the CO2? If you use the Internet to answer this question, be sure to explain this in your own words and cite your source by copying and pasting the URL. 

9. When your muscles do not get enough oxygen during a strenuous workout, glucose cannot be broken down properly.

a. What chemical builds up in the muscles and causes pain? 

Do some research about this build up.

b. What can you do to prevent it?

c. How can deep breathing help reduce it?

d. How can water help reduce it?