Chapter 8

Last update by mayur on 03/27/2014
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A chemical reaction that has a positive

Answer:

A) endergonic.(absorption of energy)


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    Answered in Chapter 8

    Which of the following best describes enthalpy (H)?

    A) the total kinetic energy of a system

    B) the heat content of a chemical system

    C) the system's entropy

    D) the cell's energy equilibrium

    E) the condition of a cell that is not able to react



    B) the heat content of a chemical system



  • feldman2009
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    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 releasesfree energy.

    D) Its terminal phosphate bond has higher energy than the other two.

    E) A, B, C, and D



    B) It provides energy coupling between exergonic and endergonic reactions.



  • feldman2009
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    When 10,000 molecules of ATP are hydrolyzed to ADP and Pi in a test tube, about twice asmuch heat is liberated as when a cell hydrolyzes the same amount of ATP. Which of thefollowing 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 ina test tube.

    D) The reaction in cells must be catalyzed by enzymes, but the reaction in a test tube does notneed enzymes.

    E) Reactant and product concentrations are not the same

    E) Reactant and product concentrations are not the same
  • feldman2009
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    Which of the following is most similar in structure to ATP?

    A) an anabolic steroid

    B) a DNA helix

    C) an RNA nucleotide

    D) an amino acid with three phosphate groups attached

    E) a phospholipid



    C) an RNA nucleotide



  • feldman2009
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    What term is used to describe the transfer of free energy from catabolic pathways to anabolicpathways?

    A) feedback regulation

    B) bioenergetics

    C) energy coupling

    D) entropy

    E) cooperativity

    C) energy coupling



  • feldman2009
    Answered in Chapter 8

    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 supplyenergy in the form ofATP.

    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.

    B) They are usually coupled with anabolic pathways to which they supplyenergy in the form ofATP.



  • feldman2009
    Answered in Chapter 8

    When chemical, transport, or mechanical work is done by an organism, what happens to theheat generated?

    A) It is used to power yet more cellular work.

    B) It is used to store energy as more ATP.

    C) It is used to generate ADP from nucleotide precursors.

    D) It is lost to the environment.

    E) It is transported to specific organs such as the brain.

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  • feldman2009
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    When ATP releases some energy, it also releases inorganic phosphate. What purpose doesthis serve (if any) in the cell?

    A) It is released as an excretory waste.

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    C) It can be added to water and excreted as a liquid.

    D) It can be added to other molecules in order to activate them.

    E) Itcan enter the nucleus to affect gene expression.



    D) It can be added to other molecules in order to activate them.



  • feldman2009
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    What must be the difference (if any) between the structure of ATP and the structure of theprecursor of the A nucleotide in DNA and RNA?

    A) The sugar molecule is different.

    B) The nitrogen-containing base is different.

    C) The number of phosphates is three instead of one.

    D) The number of phosphates is three instead of two.

    E) There is no difference

    E) There is no difference
  • feldman2009
    Answered in Chapter 8

    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 opposite from the reaction in the absence of theenzyme.

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    D) A and B only

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  • feldman2009
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    Sucrose is a disaccharide, composed of the monosaccharides glucose and fructose. Thehydrolysis of sucrose by the enzyme sucrase results in

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    B) the release of water from sucrose as the bond between glucose and fructose is broken.

    C) breaking the bond between glucose and fructose and forming new bonds from the atoms ofwater.

    D) production of water from the sugar as bonds are broken between the glucose monomers.

    E) utilization of water as a covalent bond is formed between glucose and fructose to formsucrase.



    C) breaking the bond between glucose and fructose and forming new bonds from the atoms ofwater.