Chapter 9 Test - AP Biology

40 Questions | Total Attempts: 2433

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Chapter 9 Test - AP Biology

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Questions and Answers
  • 1. 
    What is the term for metabolic pathways that release stored energy by breaking down complex molecules?
    • A. 

      Anabolic pathways

    • B. 

      Catabolic pathways

    • C. 

      Fermentation pathways

    • D. 

      Thermodynamic pathways

    • E. 

      Bioenergetic pathways

  • 2. 
    What is the term used for the metabolic pathway in which glucose (C6H12O6) is degraded to carbon dioxide (CO2) and water?
    • A. 

      Cellular respiration

    • B. 

      Glycolysis

    • C. 

      Fermentation

    • D. 

      Citric acid cycle

    • E. 

      Oxidative phosphorylation

  • 3. 
    Which of the following statements concerning the metabolic degradation of glucose (C6H12O6) to carbon dioxide (CO2) and water is (are) true?
    • A. 

      The breakdown of glucose to carbon dioxide and water is exergonic.

    • B. 

      The breakdown of glucose to carbon dioxide and water has a free energy change of -686 kcal/mol.

    • C. 

      The breakdown of glucose to carbon dioxide and water involves oxidation-reduction or redox reactions.

    • D. 

      The breakdown of glucose to carbon dioxide and water is exergonic and has a free energy change of -686 kcal/mol.

    • E. 

      The breakdown of glucose to carbon dioxide and water is exergonic, has a free energy change of -686 kcal/mol, and involves oxidation-reduction or redox reactions.

  • 4. 
    Which of the following statements is (are) correct about an oxidation-reduction (or redox) reaction?
    • A. 

      The molecule that is reduced gains electrons.

    • B. 

      The molecule that is oxidized loses electrons.

    • C. 

      The molecule that is reduced loses electrons.

    • D. 

      The molecule that is oxidized gains electrons.

    • E. 

      The molecule that is reduced gains electrons and the molecule that is oxidized loses electrons.

  • 5. 
    Which statement is not correct with regard to redox (oxidation-reduction) reactions?
    • A. 

      A molecule is reduced if it loses electrons.

    • B. 

      A molecule is oxidized if it loses electrons.

    • C. 

      An electron donor is called a reducing agent.

    • D. 

      An electron acceptor is called an oxidizing agent.

    • E. 

      Oxidation and reduction always go together.

  • 6. 
    The molecule that functions as the reducing agent (electron donor) in a redox or oxidation-reduction reaction
    • A. 

      Gains electrons and gains energy.

    • B. 

      Loses electrons and loses energy.

    • C. 

      Gains electrons and loses energy.

    • D. 

      Loses electrons and gains energy.

    • E. 

      Neither gains nor loses electrons, but gains or loses energy.

  • 7. 
    When electrons move closer to a more electronegative atom, what happens?
    • A. 

      Energy is released.

    • B. 

      Energy is consumed.

    • C. 

      The more electronegative atom is reduced.

    • D. 

      The more electronegative atom is oxidized.

    • E. 

      Energy is released and the more electronegative atom is reduced.

  • 8. 
    Why does the oxidation of organic compounds by molecular oxygen to produce CO2 and water release free energy?
    • A. 

      The covalent bonds in organic molecules are higher energy bonds than those in water and carbon dioxide.

    • B. 

      Electrons are being moved from atoms that have a lower affinity for electrons (such as C) to atoms with a higher affinity for electrons (such as O).

    • C. 

      The oxidation of organic compounds can be used to make ATP.

    • D. 

      The electrons have a higher potential energy when associated with water and CO2 than they do in organic compounds.

    • E. 

      The covalent bond in O2 is unstable and easily broken by electrons from organic molecules.

  • 9. 
    Which of the following statements describes the results of this reaction? C6H12O6  +  6 O2  →  6 CO2  +  6 H2O  +  Energy
    • A. 

      C6H12O6 is oxidized and O2 is reduced.

    • B. 

      O2 is oxidized and H2O is reduced.

    • C. 

      CO2 is reduced and O2 is oxidized.

    • D. 

      C6H12O6is reduced and CO2 is oxidized.

    • E. 

      O2 is reduced and CO2 is oxidized.

  • 10. 
    When a glucose molecule loses a hydrogen atom (not a hydrogen ion) as the result of an oxidation-reduction reaction, the molecule becomes 
    • A. 

      Dehydrogenated.

    • B. 

      Hydrogenated.

    • C. 

      Oxidized.

    • D. 

      Reduced.

    • E. 

      An oxidizing agent.

  • 11. 
    When a molecule of NAD+ (nicotinamide adenine dinucleotide) gains a hydrogen atom (not a hydrogen ion) the molecule becomes
    • A. 

      Hydrogenated.

    • B. 

      Oxidized.

    • C. 

      Reduced.

    • D. 

      Redoxed.

    • E. 

      A reducing agent.

  • 12. 
    Which of the following statements about NAD+ is false?
    • A. 

      NAD+ is reduced to NADH during both glycolysis and the citric acid cycle.

    • B. 

      NAD+ has more chemical energy than NADH.

    • C. 

      NAD+ is reduced by the action of dehydrogenases.

    • D. 

      NAD+ can receive electrons for use in oxidative phosphorylation.

    • E. 

      In the absence of NAD+, glycolysis cannot function.

  • 13. 
    In order for NAD+ to remove electrons from glucose or other organic molecules, which of the following must be true?
    • A. 

      The organic molecule or glucose must be negatively charged in order to reduce the positively charged NAD+.

    • B. 

      Oxygen must be present to oxidize the NADH produced back to NAD+.

    • C. 

      The free energy liberated when electrons are removed from the organic molecules must be greater than the energy required to give the electrons to NAD+.

    • D. 

      The organic molecule or glucose must be negatively charged in order to reduce the positively charged NAD+. Oxygen must be present to oxidize the NADH produced back to NAD+.

    • E. 

      The organic molecule or glucose must be negatively charged in order to reduce the positively charged NAD+. Oxygen must be present to oxidize the NADH produced back to NAD+. The free energy liberated when electrons are removed from the organic molecules must be greater than the energy required to give the electrons to NAD+.

  • 14. 
    Where does glycolysis takes place?
    • A. 

      Mitochondrial matrix

    • B. 

      Mitochondrial outer membrane

    • C. 

      Mitochondrial inner membrane

    • D. 

      Mitochondrial intermembrane space

    • E. 

      Cytosol

  • 15. 
    The ATP made during glycolysis is generated by
    • A. 

      Substrate-level phosphorylation.

    • B. 

      Electron transport.

    • C. 

      Photophosphorylation.

    • D. 

      Chemiosmosis.

    • E. 

      Oxidation of NADH to NAD+.

  • 16. 
    The oxygen consumed during cellular respiration is involved directly in which process or event?
    • A. 

      Glycolysis

    • B. 

      Accepting electrons at the end of the electron transport chain

    • C. 

      The citric acid cycle

    • D. 

      The oxidation of pyruvate to acetyl CoA

    • E. 

      The phosphorylation of ADP to form ATP

  • 17. 
    Which process in eukaryotic cells will proceed normally whether oxygen (O2) is present or absent?
    • A. 

      Electron transport

    • B. 

      Glycolysis

    • C. 

      The citric acid cycle

    • D. 

      Oxidative phosphorylation

    • E. 

      Chemiosmosis

  • 18. 
    Which of the following statements about glycolysis false?
    • A. 

      Glycolysis has steps involving oxidation-reduction reactions.

    • B. 

      The enzymes of glycolysis are located in the cytosol of the cell.

    • C. 

      Glycolysis can operate in the complete absence of O2.

    • D. 

      The end products of glycolysis are CO2 and H2O.

    • E. 

      Glycolysis makes ATP exclusively through substrate-level phosphorylation.

  • 19. 
    The figure below illustrates some of the steps (reactions) of glycolysis in their proper sequence.  Each step is lettered.  Use these letters to answer the question. Which step shows a split of one molecule into two smaller molecules?
  • 20. 
    The figure below illustrates some of the steps (reactions) of glycolysis in their proper sequence.  Each step is lettered.  Use these letters to answer the question. In which step is an inorganic phosphate added to the reactant?
  • 21. 
    The figure below illustrates some of the steps (reactions) of glycolysis in their proper sequence.  Each step is lettered.  Use these letters to answer the question. In which reaction does an intermediate pathway become oxidized?  
  • 22. 
    The figure below illustrates some of the steps (reactions) of glycolysis in their proper sequence.  Each step is lettered.  Use these letters to answer the question. Which step involves an endergonic reaction?
  • 23. 
    The figure below illustrates some of the steps (reactions) of glycolysis in their proper sequence.  Each step is lettered.  Use these letters to answer the question. Which step consists of a phosphorylation reaction in which ATP is the phosphate source?
  • 24. 
    Substrate-level phosphorylation accounts for approximately what percentage of the ATP formed during glycolysis?
    • A. 

      0%

    • B. 

      2%

    • C. 

      10%

    • D. 

      38%

    • E. 

      100%

  • 25. 
    During glycolysis, when glucose is catabolized to pyruvate, most of the energy of glucose is
    • A. 

      Transferred to ADP, forming ATP.

    • B. 

      Transferred directly to ATP.

    • C. 

      Retained in the pyruvate.

    • D. 

      Stored in the NADH produced.

    • E. 

      Used to phosphorylate fructose to form fructose-6-phosphate.

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