Cellular Energetics Practice Quiz 1

90 Questions | Total Attempts: 79

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Cellular Biology Quizzes & Trivia

Quiz over AP Biology Unit 3: Cellular Energetics (Cell Respiration and Photosynthesis)


Questions and Answers
  • 1. 
    Which of the following describe(s) some aspect of metabolism?
    • A. 

      Synthesis of macromoleculessynthesis of macromolecules

    • B. 

      Breakdown of macromolecules

    • C. 

      Control of enzyme activity

    • D. 

      A and B only

    • E. 

      A, B, and C

  • 2. 
    Which term most precisely describes the cellular process of breaking down large molecules into smaller ones?
    • A. 

      Catalysis

    • B. 

      Metabolism

    • C. 

      Anabolism

    • D. 

      Dehydration

    • E. 

      Catabolism

  • 3. 
    Which of the following statements correctly describe(s) catabolic pathways?
    • A. 

      They do not depend on enzymes.

    • B. 

      They consume energy to build up polymers from monomers.

    • C. 

      They release energy as they degrade polymers to monomers.

    • D. 

      They lead to the synthesis of catabolic compounds.

    • E. 

      Both A and B

  • 4. 
    Which of the following is (are) true for anabolic pathways?
    • A. 

      They do not depend on enzymes.

    • B. 

      They are highly regulated sequences of chemical reactions.

    • C. 

      They consume energy to build up polymers from monomers.

    • D. 

      They release energy as they degrade polymers to monomers.

    • E. 

      Both B and C

  • 5. 
    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

  • 6. 
    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

  • 7. 
      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. 

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

    • D. 

      Only A and B are correct.

    • E. 

      A, B, and C are correct.

  • 8. 
    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. 

      Both A and B are correct.

  • 9. 
    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.

  • 10. 
    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.

  • 11. 
    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. 

      C6H12O6 is reduced and CO2 is oxidized.

    • E. 

      O2 is reduced and CO2 is oxidized.

  • 12. 
    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.

  • 13. 
    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.

  • 14. 
    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. 

      A and B are both correct.

    • E. 

      A, B, and C are all correct.

  • 15. 
    Where does glycolysis takes place?
    • A. 

      Mitochondrial matrix

    • B. 

      Mitochondrial outer membrane

    • C. 

      Mitochondrial inner membrane

    • D. 

      Mitochondrial intermembrane space

    • E. 

      Cytosol

  • 16. 
    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.

  • 17. 
    Why is ATP an important molecule in metabolism?
    • A. 

      Its hydrolysis provides an input of free energy for exergonic reactions.

    • B. 

      It provides energy coupling between exergonic and endergonic reactions.

    • C. 

      Its terminal phosphate group contains a strong covalent bond that when hydrolyzed releases free energy.

    • D. 

      . A and B only

    • E. 

      A, B and C

  • 18. 
    The hydrolysis of ATP to ADP and inorganic phosphate (ATP + H2O --> ADP + Pi )
    • A. 

      Has a G of about -7 kcal/mol under standard conditions.

    • B. 

      Involves hydrolysis of a terminal phosphate bond of ATP.

    • C. 

      Can occur spontaneously under appropriate conditions.

    • D. 

      Only A and B are correct.

    • E. 

      A, B, and C are correct.

  • 19. 
    When 10,000 molecules of ATP are hydrolyzed to ADP and Pi in a test tube, about twice as much heat is liberated as when a cell hydrolyzes the same amount of ATP. Which of the following is the best explanation for this observation?
    • A. 

      Cells are open systems, but a test tube is a closed system.

    • B. 

      Cells are less efficient at heat production than nonliving systems.

    • C. 

      The hydrolysis of ATP in a cell produces different chemical products than does the reaction in a test tube.

    • D. 

      The reaction in cells must be catalyzed by enzymes, but the reaction in a test tube does not need enzymes.

    • E. 

      Cells convert some of the energy of ATP hydrolysis into other forms of energy besides heat.

  • 20. 
    ATP generally energizes a cellular process by
    • A. 

      Releasing heat upon hydrolysis.

    • B. 

      Acting as a catalyst.

    • C. 

      Coupling free energy released by ATP hydrolysis to free energy needed by other reactions.

    • D. 

      Breaking a high-energy bond.

    • E. 

      Binding directly to the substrate(s) of the enzyme.

  • 21. 
    What term is used to describe the transfer of free energy from catabolic pathways to anabolic pathways?
    • A. 

      Feedback regulationfeedback regulation

    • B. 

      Bioenergetics

    • C. 

      Energy coupling

    • D. 

      Entropy

    • E. 

      Cooperativity

  • 22. 
    Which of the following statements is true concerning catabolic pathways?
    • A. 

      They combine molecules into more energy-rich molecules.

    • B. 

      They are usually coupled with anabolic pathways to which they supply energy in the form of ATP.

    • C. 

      They are endergonic.

    • D. 

      They are spontaneous and do not need enzyme catalysis.

    • E. 

      They build up complex molecules such as protein from simpler compounds.

  • 23. 
    Which of the following statements regarding ATP is (are) correct?
    • A. 

      ATP serves as a main energy shuttle inside cells.

    • B. 

      ATP drives endergonic reactions in the cell by the enzymatic transfer of the phosphate group to specific reactants.

    • C. 

      The regeneration of ATP from ADP and phosphate is an endergonic reaction.

    • D. 

      A and B only

    • E. 

      A, B, and C

  • 24. 
    Which of the following statements is (are) true about enzyme-catalyzed reactions?
    • A. 

      The reaction is faster than the same reaction in the absence of the enzyme.

    • B. 

      The free energy change of the reaction is the same as the reaction in the absence of the enzyme.

    • C. 

      The reaction always goes in the direction toward chemical equilibrium.

    • D. 

      A and B only

    • E. 

      A, B, and C

  • 25. 
    How can one increase the rate of a chemical reaction?
    • A. 

      Increase the activation energy needed.

    • B. 

      Cool the reactants.

    • C. 

      Decrease the concentration of the reactants.

    • D. 

      Add a catalyst.

    • E. 

      Increase the entropy of the reactants.