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Biology 1401 Chapter 7 How Cells Harvest Energy

26 Questions
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  • 1. 
    A molecule that stores energy by linking charged phosphate groups each other is called
    • A. 

      ATP.

    • B. 

      NADH.

    • C. 

      FADH.

    • D. 

      Cyclic AMP.

    • E. 

      Pyruvate.

  • 2. 
    An electron carrier that is used in harvesting energy from glucose molecules in a series of gradual steps in the cytoplasm is
    • A. 

      Pyruvate.

    • B. 

      Cyclic AMP.

    • C. 

      ATP.

    • D. 

      NAD+.

    • E. 

      NADH.

  • 3. 
    In eukaryotes, the glycolytic reactions take place in the
    • A. 

      Mitochondria of the cell.

    • B. 

      Cytoplasm of the cell.

    • C. 

      Ribosomes of the cell.

    • D. 

      Endoplasmic reticulum of each cell.

    • E. 

      Golgi bodies of the cell.

  • 4. 
    The first stage of cellular respiration is
    • A. 

      Decarboxylation.

    • B. 

      Deamination.

    • C. 

      Fermentation.

    • D. 

      Chemiosmosis.

    • E. 

      Glycolysis.

  • 5. 
    In the absence of oxygen, hydrogen atoms generated by glycolysis are donated to organic molecules in a process called
    • A. 

      Fermentation.

    • B. 

      Decarboxylation.

    • C. 

      Chemiosmosis.

    • D. 

      Electron transport chain reactions.

    • E. 

      Acetyl-CoA formation.

  • 6. 
    Which of the following statements abotu fermentation is false?
    • A. 

      Fermentation takes place only in the absence of oxygen.

    • B. 

      The recipient of hydrogen atoms is an organic molecule.

    • C. 

      Water is not one of the by-products.

    • D. 

      The Krebs cycle and electron transfer system do not occur.

    • E. 

      Cells can only undergo one type of fermentation.

  • 7. 
    Chemiosmotic generation of ATP is driven by
    • A. 

      Pi transfer through the plasma membrane.

    • B. 

      The NA+/K+ pump.

    • C. 

      A difference in H+ concentration on the two sides of the mitochondrial membrane.

    • D. 

      Osmosis of macromolecules.

    • E. 

      Large quantities of ADP.

  • 8. 
    The reaction, C(6)H(12)O(6) + 6O(2) = 6 CO(2) + 6 H(2)O, when it occurs in living cells is known as
    • A. 

      Aerobic fermentation.

    • B. 

      Anaerobic fermentation.

    • C. 

      Aerobic respiration.

    • D. 

      Glycolysis.

    • E. 

      Oxidative phosphorylation.

  • 9. 
    In oxidative respiration, energy is harvested from glucose molecules in a sequence of four major pathways. Which of the following is not one of these four pathways?
    • A. 

      Krebs cycle

    • B. 

      Glycolysis

    • C. 

      Electron transfer through the transport chain

    • D. 

      Beta oxidation

    • E. 

      Pyruvate oxidation

  • 10. 
    A process common to all living organisms, aerobic and anaerobic, is
    • A. 

      Glycolysis.

    • B. 

      Fermentation.

    • C. 

      The Krebs cycle.

    • D. 

      Electron transport chain reactions.

    • E. 

      Pyruvate oxidation.

  • 11. 
    All of the following are the end products of glycolysis except
    • A. 

      Pyruvate.

    • B. 

      ATP.

    • C. 

      NADH.

    • D. 

      NAD+.

    • E. 

      Energy.

  • 12. 
    The end-product of glycolysis is
    • A. 

      ATP.

    • B. 

      NAD+.

    • C. 

      Alcohol.

    • D. 

      ADP.

    • E. 

      Pyruvate.

  • 13. 
    The enzymes catalyzing the reactions of glycolysis are found in the
    • A. 

      Mitochondria.

    • B. 

      Cytoplasm.

    • C. 

      Chloroplasts.

    • D. 

      Nucleus.

    • E. 

      Golgi apparatus.

  • 14. 
    The decarboxylation step of oxidation of pyruvate takes place in the
    • A. 

      Cytoplasm.

    • B. 

      Golgi body.

    • C. 

      Ribosome.

    • D. 

      Mitochondrion.

    • E. 

      Nucleus.

  • 15. 
    The decarboxylation of pyruvate produces all of the following except
    • A. 

      NADH.

    • B. 

      Acetyl-CoA.

    • C. 

      CO(2).

    • D. 

      ATP.

  • 16. 
    In the cyclic reaction sequence called the Krebs cycle, the following chemical events take place except
    • A. 

      The acetyl group is joined with a four carbon molecule, oxaloacetate.

    • B. 

      The resulting six carbon molecule is oxidized.

    • C. 

      Electrons generated are used to produce NADH.

    • D. 

      Two carbons per cycle are made into CO(2) molecules.

    • E. 

      Pyruvate molecules are restored to the cycle.

  • 17. 
    A single glucose molecule can drive the Krebs cycle
    • A. 

      One turn.

    • B. 

      Two turns.

    • C. 

      Three turns.

    • D. 

      Four turns.

    • E. 

      Six turns.

  • 18. 
    The coenzyme electron carriers produced in the Krebs cycle are
    • A. 

      ATP and ADP.

    • B. 

      Pyruvate and acetyl-CoA.

    • C. 

      FADH(2) and NADH.

    • D. 

      NAD and NADH.

    • E. 

      NADH and ATP.

  • 19. 
    The oxygen utilized in cellular respiration finally shows up as
    • A. 

      CO(2).

    • B. 

      ATP.

    • C. 

      New O(2).

    • D. 

      H(2)O.

    • E. 

      Part of a sugar.

  • 20. 
    The enzymes of the Krebs cycle are located in the
    • A. 

      Cytoplasm.

    • B. 

      Inter-membrane space of mitochondria.

    • C. 

      Vesicles of the ER.

    • D. 

      Outer membrane of the mitochondria.

    • E. 

      Matrix of the mitochondria.

  • 21. 
    Since membranes are relatively impermeable to ions, most of the protons re-enter the matrix of mitochondria by passing through special channels in the inner mitochondrial membrane. Because of the inward flow of protons these channels allow the synthesis of
    • A. 

      ADP from ATP and Pi.

    • B. 

      ATP from ADP and Pi.

    • C. 

      Glucose from pyruvate.

    • D. 

      Acetyl-CoA from pyruvate.

    • E. 

      Citrate from oxaloacetate and acetyl-CoA.

  • 22. 
    Regardless of the electron or hydrogen acceptor used, one of the products of fermentation is always
    • A. 

      ADP.

    • B. 

      ATP.

    • C. 

      NAD+.

    • D. 

      Pyruvate.

    • E. 

      Alcohol.

  • 23. 
    Yeast cells under anaerobic conditions
    • A. 

      Die.

    • B. 

      Produce ethyl alcohol (ethanol).

    • C. 

      Produce oxygen.

    • D. 

      Switch to oxidative respiration.

    • E. 

      Push the glycolytic pathway backward.

  • 24. 
    In muscle cells, fermentation produces not alcohol but
    • A. 

      ATP.

    • B. 

      NADH.

    • C. 

      Pyruvate.

    • D. 

      Kinetic energy.

    • E. 

      Lactic acid.

  • 25. 
    During respiration the final acceptor of the hydrogen atoms is
    • A. 

      Oxygen.

    • B. 

      Carbon dioxide.

    • C. 

      Water.

    • D. 

      Glucose.

    • E. 

      Pyruvate.

  • 26. 
    Select the correct sequence concerning glucose catabolism.
    • A. 

      Glycolysis --> Pyruvate --> Acetyl CoA --> Electron Transport Chain --> Krebs Cycle

    • B. 

      Glycolysis --> Pyruvate --> Acetyl CoA --> Krebs Cycle --> Electron Transport Chain

    • C. 

      Glycolysis --> Acetyl CoA --> Pyruvate --> Electron Transport Chain --> Krebs Cycle

    • D. 

      Glycolysis --> Acetyl CoA --> Pyruvate --> Krebs Cycle --> Electron Transport Chain