Chapter 25 Objectives
                        Metabolism

1. Identify the body functions that receive energy from the catabolism of glucose.

2. Compare oxidation and reduction reactions.

3. Describe the roles of the two major coenzymes in the catabolism of glucose.

4. Describe the reactions and the products of GLYCOLYSIS.

5. Explain why acetyl coenzyme A must be produced.

6. Describe in general terms the events that occur in the Krebs cycle.

Take a Quiz - Chapter 25

1.Catabolism provides the ATP for:
    a. the synthesis of large molecules
    b. transcription and translation
    c. cell division
    d. peristalsis
    e. all of the above

2. The oxidation of glucose is described as:
    a. the removal of phosphate from the glucose molecule
    b. the removal of hydrogen from the glucose molecule
    c. the addition of oxygen to the glucose molecule
    d. the addition of hydrogen to the glucose molecule

3. Describe the role of the coenzymes NAD and FAD.
    a. these coenzymes carry ATP
    b. NAD and FAD control all steps of energy metabolism
    c. these coenzymes cannot function in the presence of oxygen
    d. when these coenzymes are reduced they are the carriers of hydrogen

4. Identify the false statement regarding the reactions in glycolysis.
    a. this is an anaerobic pathway
    b. this series of reactions produces two ATP molecules
    c. pyruvic acid is the end product of this series of reactions
    d. there are no reductions of NAD in this pathway

5. What happens to pyruvic acid after glycolysis?
    a. it must undergo further oxidation before entering the mitochondria
    b. this source of ATP enters the Krebs cycle
    c. pyruvic acid enters the electron transport chain
    d. pyruvic acid is converted to oxaloacetic acid

6. In the complete aerobic breakdown of the glucose molecule, the carbon atoms:
    a. are eliminated as acetyl coenzyme A
    b. are converted to citric acid
    c. are found in molecules of carbon dioxide
    d. become a stable product that we use for energy

7. Identify the stage of cellular respiration that has the majority of reduction reactions of the original
    glucose molecule.
    a. glycolysis
    b. the conversion to acetyl coenzyme A
    c, the Krebs cycle
    d. the electron transport chain

8. Identify the stage of cellular respiration that produces the largest amount of ATP.
    a. glycolysis
    b. the conversion to acetly coenzyme
    c, the Krebs cycle
    d. the electron transport chain

9. Identify what happens when the mitochondrial proton pump produces an energy gradient:
    a. this causes the hydrogen atoms to be ionized
    b. this reenergizes the carriers NAD and FAD
    c. the stage is set for H⁺ movement to produce a large amount of energy
    d. the energy released is captured in the glucose molecule

10. Inspired oxygen is the last molecule to be reduced in:
    a. glycolysis
    b. the conversion to acetly coenzyme
    c, the Krebs cycle
    d. the electron transport chain