Biology 1401 Chapter 6 Energy And Metabolism

29 Questions | Total Attempts: 556

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  • 1. 
    Oxidation and reduction reactions are chemical processes that result in a gain or loss in
    • A. 

      Atoms.

    • B. 

      Neutrons.

    • C. 

      Electrons.

    • D. 

      Molecules.

    • E. 

      Protons.

  • 2. 
    Reactions that occur spontaneously and release free energy are called _____ reactions.
    • A. 

      Activation

    • B. 

      Exergonic

    • C. 

      Catabolistic

    • D. 

      Thermodynamic

    • E. 

      Endergonic

  • 3. 
    A chemical reaction in which the products contain less energy than the ____ will tend to proceed spontaneously.
    • A. 

      Reactants

    • B. 

      Enzymes

    • C. 

      Coenzymes

    • D. 

      Substrates

    • E. 

      Cofactors

  • 4. 
    Protein catalysts that speed up the various metabolic biological reactions in an organism are called.
    • A. 

      Substrates.

    • B. 

      Cofactors.

    • C. 

      Reactants.

    • D. 

      Products.

    • E. 

      Enzymes.

  • 5. 
    Enzymes have specific ____ with which they interact.
    • A. 

      Products

    • B. 

      Substrates

    • C. 

      Reactants

    • D. 

      Atoms

    • E. 

      End-products

  • 6. 
    The specificity of an enzyme is due to its active site. The active site is shpaed so that only a certain
    • A. 

      Substrate molecule can fit into it.

    • B. 

      Product molecule can fit into it.

    • C. 

      Reactant molecule can fit into it.

    • D. 

      Cofactor molecule can fit into it.

    • E. 

      Histone molecule can fit into it.

  • 7. 
    The organic non-protein components that aid in enzyme functioning are called
    • A. 

      Reactants.

    • B. 

      Cofactors.

    • C. 

      Coenzymes.

    • D. 

      Substrates.

    • E. 

      Products.

  • 8. 
    The inorganic non-protein components that participate in enzyme catalysis are known as
    • A. 

      Coenzymes.

    • B. 

      Cofactors.

    • C. 

      End-products.

    • D. 

      Substrates.

    • E. 

      Reactants.

  • 9. 
    The chief energy currency of all cells is a molecule called
    • A. 

      Cyclic AMP.

    • B. 

      NADH.

    • C. 

      FADH.

    • D. 

      ATP.

    • E. 

      ADP.

  • 10. 
    The chemistry of living systems representing all chemical reactions is called
    • A. 

      Catabolism.

    • B. 

      Anabolism.

    • C. 

      Metabolism.

    • D. 

      Enzymology.

    • E. 

      Thermodynamics.

  • 11. 
    A calorie is the commonly used unit of chemical energy. It is also the unit of
    • A. 

      Light.

    • B. 

      Magnetism.

    • C. 

      Sound.

    • D. 

      Heat.

    • E. 

      Radioactivity.

  • 12. 
    When an atom or molecule gains one or more electrons, it is said to be
    • A. 

      Energized.

    • B. 

      Oxidized.

    • C. 

      Polarized.

    • D. 

      Activated.

    • E. 

      Reduced.

  • 13. 
    Life's ultimate source of energy is derived from
    • A. 

      The sun.

    • B. 

      Plants.

    • C. 

      Water.

    • D. 

      Air.

    • E. 

      Cells.

  • 14. 
    Reactions that do not proceed spontaneously because they require energy from an outside source are called
    • A. 

      Exergonic.

    • B. 

      Xerogonic.

    • C. 

      Metabolic.

    • D. 

      Endergonic.

    • E. 

      Endocytic.

  • 15. 
    Molecules that act as catalysts in biological systems are
    • A. 

      ATP.

    • B. 

      Cofactors.

    • C. 

      Coenzymes.

    • D. 

      Enzymes.

    • E. 

      Genes.

  • 16. 
    Enzymes catalyze chemical reactions by lowering the
    • A. 

      Entropy.

    • B. 

      Free energy.

    • C. 

      Activation energy.

    • D. 

      Enthalpy.

    • E. 

      Calories.

  • 17. 
    In an enzyme catalyzed reaction the reactant is called the
    • A. 

      Ribozyme.

    • B. 

      Catalyst.

    • C. 

      Substrate.

    • D. 

      End-product.

    • E. 

      Activator.

  • 18. 
    When the substrate is bound to the enzyme, the shape of the enzyme may change slightly, leading to
    • A. 

      A better induced fit.

    • B. 

      A great range of possible catalytic activities.

    • C. 

      A greater supply of activation energy.

    • D. 

      More permanent binding through intimate total contact.

    • E. 

      More possible products of the reaction.

  • 19. 
    Enzymes are very specific in their choices of substrates because each different enzyme has an active site that
    • A. 

      Depends on unusual amino acids not common in proteins.

    • B. 

      Has a certain unique amino acid to fit each substrate.

    • C. 

      Is shaped to fit a certain substrate molecule.

    • D. 

      Is lined with glycolipids and glycoproteins.

    • E. 

      Passes electrons from one part of the substrate to another.

  • 20. 
    At the conclusion of an enzyme catalyzed reaction, the enzyme
    • A. 

      Must be resynthesized from its amino acids.

    • B. 

      Frees itself from the product and is ready to be reused.

    • C. 

      Must be transported from outside of the cell.

    • D. 

      Changes into an active form.

    • E. 

      Closes up its active site and cannot bind to more substrate.

  • 21. 
    The ability of an enzyme to catalyze a reaction is not affected by
    • A. 

      Temperature.

    • B. 

      PH.

    • C. 

      Salt concentration.

    • D. 

      Binding of specific regulatory molecules.

    • E. 

      Excess cofactor.

  • 22. 
    The sites where molecules other than substrates bind in an enzyme to alter its activity are called _____ sites.
    • A. 

      Catalytic

    • B. 

      Allosteric

    • C. 

      Metabolic

    • D. 

      Amino acid

    • E. 

      Activity

  • 23. 
    One of the most important coenzymes that accepts electrons/hydrogens is
    • A. 

      NAD+.

    • B. 

      NADH.

    • C. 

      ATP.

    • D. 

      NADPH.

    • E. 

      Ribozyme.

  • 24. 
    ATP gives up energy when it is converted to
    • A. 

      DNA.

    • B. 

      NADP.

    • C. 

      NADH.

    • D. 

      ADP and phosphate.

    • E. 

      RNA.

  • 25. 
    Under standard conditions, ATP can release for every molecule
    • A. 

      Less than 1 cal of energy.

    • B. 

      1 to 2 cal of energy.

    • C. 

      7.3 Kcal of energy.

    • D. 

      7.3 cal of energy.

    • E. 

      Different amounts of energy depending on the cell.

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