PHOTOSYNTHESIS and CELLULAR RESPIRATION WORKSHEET

30 points        Answers

Photosynthesis

1. What molecule is the initial electron donor in the light-dependent reactions of photosynthesis? (1 point)

 

2. What is the location of the electron transport chain in the light-dependent reactions of photosynthesis? (1 point)


3. . What is, in essence, a waste product of the light-dependent reactions that is absolutely essential in cellular respiration?  (1 point)


4. What is the purpose of the electrons being passed back-and-forth (across the membrane) in the electron transport chain? (1 point)

 

5. What two molecules are passed from the light-dependent reactions to the light-independent reactions? (1 point)

 

6. Why are the light-independent reactions not truly independent of light (at least two possible answers)? (1 point)

 

7. Why is the enzyme that fixes carbon (dioxide) in the light-independent reactions not actually the "best" enzyme for fixing carbon? (1 point)

 

8. What does the designation "C4 plants" refer to, and what enzyme to they use to initially fix CO2? (2 points)


9. What environments are you likely to find C4 (and CAM) plants in? (1 point)


10. What's special about CAM plants, and why do they do what they do? (2 points)

 

11. What atom is in the middle of the chlorophyll molecule that is necessary for chlorophyll function (this will require that you look in the book)? (1 point)


Cellular Respiration

1. What molecule is the initial electron donor in the electron transport chain (oxidative phosphorylation)? (1 point)


2. What is the location of the electron transport chain in cellular respiration? (1 point)


3. What waste product of photosynthesis is essential in aerobic respiration, and what precisely does it do? (2 points)

4. True or false: Plants carry on cellular respiration as well as photosynthesis. (1 point)

 

5. How many ATP can be generated from one glucose molecule in aerobic respiration? from one NADH + H+? (1 point)


6. What two series of reactions are involved in anaerobic respiration? (1 point)

 

7. What product(s) of glycolysis are passed on to the Krebs' cycle? (1 point)

 

8. Where within a cell does fermentation occur, and why does it occur? (2 points)


9. Are the first couple of steps of glycolysis exergonic or endergonic? (1 point)

 

10. How many ATP are produced by substrate-level phosphorylation in glycolysis? in the Krebs' cycle? (1 point)

 

11.  Where do all the carbons in the original glucose molecule end up? (1 pt.)
 


12. How many carbons are in the pieces of fatty acid molecules that can be converted into molecules that can enter cellular respiration? What molecule are these pieces converted into? (1 point)


CHEMIOSMOSIS -- Movement of protons to generate ATP (3 points)


What are the major membrane molecules that are involved in the actual process of chemiosmosis? From where to where do the H+'s move during chemiosmosis in photosynthesis? in cellular respiration?