Biochemistry: Unit II Energy Changes and Electron Transfer in Metabolism
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Biochemistry: Unit II Energy Changes and Electron Transfer in Metabolism

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Questions and Answers

Which process releases energy and involves breaking down of molecules?

  • C-C bond making
  • Anabolism
  • Nucleophilic Reactions
  • Catabolism (correct)

    • What is the sum total of all biochemical reactions that take place in an organism?

  • Adenosine Triphosphate (ATP)
  • Metabolism (correct)
  • NADP
  • FMN

    • Which type of process requires energy and involves building up of molecules?

  • Biochemical Reactions
  • C-C bond breaking
  • Anabolism (correct)
  • Firefly Bioluminescence Cycle

    • What is the process of making or breaking C-C bonds considered as?

    <p>C-C bond making</p> Signup and view all the answers

    Which type of process involves the flow of electrons in the biological system?

    <p>Biological Redox</p> Signup and view all the answers

    In the context of energy balance, what is not merely accounted in the mechanical work of motion?

    <p>Storage</p> Signup and view all the answers

    Which of the following serves as the energy currency in cells?

    <p>Adenosine triphosphate (ATP)</p> Signup and view all the answers

    What type of reaction can convert a thermodynamically unfavorable reaction sequence into a favorable one?

    <p>Group transfers</p> Signup and view all the answers

    Which of the following reactions involves nucleophilic attack at the α-position of ATP?

    <p>Adenylylation</p> Signup and view all the answers

    What is responsible for all work done by living organisms, directly or indirectly?

    <p>Oxidation-Reduction reactions</p> Signup and view all the answers

    What can relieve electrostatic repulsion among the negative charges on ATP as a result of hydrolysis?

    <p>$A \rightarrow B$ conversion coupled to ATP hydrolysis</p> Signup and view all the answers

    Which type of reaction involves transfer of acyl, glycosyl, and phosphoryl groups from one nucleophile to another in living cells?

    <p>Group-transfers reactions</p> Signup and view all the answers

    What does ATP generally convert to during the donation of energy?

    <p>$ADP + Pi$</p> Signup and view all the answers

    What serves as the electrophilic target for nucleophilic attack in adenylylation?

    <p>$eta$-position P atom of ATP</p> Signup and view all the answers

    How can a thermodynamically unfavorable reaction sequence be converted into a favorable one?

    <p>By coupling it to the hydrolysis of a sufficient number of ATP molecules in a new reaction</p> Signup and view all the answers

    Metabolism is the sum total of all biochemical reactions that take place in an organism.

    <p>True</p> Signup and view all the answers

    Catabolism is a reductive process that requires energy.

    <p>False</p> Signup and view all the answers

    Living things are not unique thermodynamic systems.

    <p>False</p> Signup and view all the answers

    Stored chemical energy can only be used to drive exergonic reactions.

    <p>False</p> Signup and view all the answers

    Adenosine Triphosphate (ATP) hydrolysis is not involved in nucleophilic reactions.

    <p>False</p> Signup and view all the answers

    The Law of Conservation of Energy states that energy intake must equal internal heat produced, work, and storage.

    <p>True</p> Signup and view all the answers

    The process of making or breaking C-C bonds is considered as a biochemical reaction.

    <p>True</p> Signup and view all the answers

    ATP serves as the energy currency that links catabolism and anabolism.

    <p>True</p> Signup and view all the answers

    The flow of electrons in oxidation-reduction reactions is responsible for all work done by living organisms.

    <p>True</p> Signup and view all the answers

    A thermodynamically unfavorable reaction sequence can be converted into a favorable one by coupling it to the hydrolysis of a sufficient number of ATP molecules.

    <p>True</p> Signup and view all the answers

    ATP provides energy by simple hydrolysis.

    <p>False</p> Signup and view all the answers

    Adenylylation involves nucleophilic attack at the γ-position of ATP.

    <p>False</p> Signup and view all the answers

    Cholesterol biosynthesis precursor involves C-C bond making or breaking.

    <p>True</p> Signup and view all the answers

    ATP consumption during strenuous exertion is 0.5 kg/min.

    <p>True</p> Signup and view all the answers

    Firefly Bioluminescence Cycle is discussed in the text.

    <p>True</p> Signup and view all the answers

    The charge separation resulting from ATP hydrolysis relieves electrostatic attraction among the negative charges on ATP.

    <p>False</p> Signup and view all the answers

    Study Notes

    Energy and Metabolism

    • Catabolism releases energy and involves breaking down of molecules.
    • Metabolism is the sum total of all biochemical reactions that take place in an organism.
    • Anabolism requires energy and involves building up of molecules.

    ATP and Energy

    • ATP serves as the energy currency that links catabolism and anabolism.
    • ATP provides energy by simple hydrolysis.
    • ATP hydrolysis is involved in nucleophilic reactions.

    Biochemical Reactions

    • The process of making or breaking C-C bonds is considered as a biochemical reaction.
    • Oxidation-reduction reactions involve the flow of electrons in the biological system.
    • Nucleophilic attack at the α-position of ATP is involved in certain reactions.

    Energy Balance

    • Energy intake must equal internal heat produced, work, and storage (Law of Conservation of Energy).
    • Stored chemical energy can only be used to drive exergonic reactions.
    • Living things are not unique thermodynamic systems.

    Reaction Sequences

    • A thermodynamically unfavorable reaction sequence can be converted into a favorable one by coupling it to the hydrolysis of a sufficient number of ATP molecules.
    • ATP consumption during strenuous exertion is not 0.5 kg/min (this is an incorrect statement).

    ATP Hydrolysis

    • ATP hydrolysis relieves electrostatic repulsion among the negative charges on ATP.
    • ATP generally converts to ADP during the donation of energy.

    Adenylylation

    • Adenylylation involves nucleophilic attack at the α-position of ATP.
    • The γ-position of ATP is not involved in adenylylation.

    Biosynthesis

    • Cholesterol biosynthesis precursor involves C-C bond making or breaking.

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    Description

    Test your knowledge on the importance of energy changes and electron transfer in metabolism with this quiz. Topics include energy balance, biochemical reactions, ATP, ATP hydrolysis, bioluminescence, flow of electrons, biological redox, and coenzymes.

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