Master the Basics of Energy Metabolism and Enzymes
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Questions and Answers

Which type of reaction releases energy and is spontaneous?

  • Exergonic reaction (correct)
  • Cellular respiration
  • Endergonic reaction
  • Photosynthesis

    • Which type of reaction requires an input of energy and is non-spontaneous?

  • Exergonic reaction
  • Cellular respiration
  • Photosynthesis
  • Endergonic reaction (correct)

    • Which process does not require continuous energy input to continue?

  • Cellular respiration
  • Spontaneous process (correct)
  • Non-spontaneous process
  • Photosynthesis

    • Which process requires continuous energy input to proceed in a certain direction?

    <p>Non-spontaneous process (A)</p> Signup and view all the answers

    What is the equation for Gibbs free energy?

    <p>G = H - TS (D)</p> Signup and view all the answers

    What does a negative enthalpy change indicate in a chemical reaction?

    <p>Exothermic reaction (D)</p> Signup and view all the answers

    Which law of thermodynamics states that every energy transfer or transformation increases the entropy or disorder of the universe?

    <p>Second law of thermodynamics (A)</p> Signup and view all the answers

    What is entropy?

    <p>A measure of the amount of order or disorder of a system (A)</p> Signup and view all the answers

    What is enthalpy?

    <p>The amount of heat energy possessed by substances (B)</p> Signup and view all the answers

    What is Gibbs free energy used for in chemistry?

    <p>To determine whether a chemical process is spontaneous or non-spontaneous (B)</p> Signup and view all the answers

    What do enzymes do in chemical reactions?

    <p>Speed up chemical reactions by lowering the activation energy required (B)</p> Signup and view all the answers

    What is enzyme specificity?

    <p>The ability of enzymes to work with multiple substrates (B)</p> Signup and view all the answers

    Which of the following is true about metabolism?

    <p>All of the above (D)</p> Signup and view all the answers

    What is the function of enzymes in metabolic pathways?

    <p>Enzymes catalyze specific chemical reactions. (B)</p> Signup and view all the answers

    Which of the following is an example of an anabolic reaction?

    <p>The building of complex organic molecules from smaller ones. (A)</p> Signup and view all the answers

    What is the definition of potential energy?

    <p>Energy stored in an object due to its location or structure. (D)</p> Signup and view all the answers

    What is the second law of thermodynamics?

    <p>Entropy tends to increase in a closed system over time. (A)</p> Signup and view all the answers

    What type of system exchanges both matter and energy with its surroundings?

    <p>Open system (A)</p> Signup and view all the answers

    Which one of the following best describes metabolism?

    <p>The sum of all reactions that occur in cells (B)</p> Signup and view all the answers

    Which one of the following is an example of a catabolic reaction?

    <p>Breaking down large molecules into smaller molecules (A)</p> Signup and view all the answers

    Which one of the following forms of energy is converted into chemical energy through photosynthesis?

    <p>Solar energy (C)</p> Signup and view all the answers

    Which one of the following best describes a closed thermodynamic system?

    <p>Energy can be exchanged between the surroundings and the system, but matter stays within the system (A)</p> Signup and view all the answers

    Which one of the following best describes the first law of thermodynamics?

    <p>The energy of the universe is constant and can be transferred or transformed but not created or destroyed (B)</p> Signup and view all the answers

    Which one of the following is NOT a learning objective of the lecture?

    <p>Catabolic and anabolic reactions (A)</p> Signup and view all the answers

    Which law of thermodynamics states that the total energy of a system plus its environment remains constant?

    <p>First law of thermodynamics (D)</p> Signup and view all the answers

    In a food chain, where does the energy from the sun go after being transferred to plants through photosynthesis?

    <p>It passes from one organism to another as they are consumed (A)</p> Signup and view all the answers

    Which law of thermodynamics states that during every energy transfer or transformation, some energy becomes unusable and is often lost as heat?

    <p>Second law of thermodynamics (D)</p> Signup and view all the answers

    What does entropy measure in a system?

    <p>The amount of order or disorder (B)</p> Signup and view all the answers

    What is Gibbs free energy used to determine in a chemical reaction?

    <p>Whether the reaction occurs spontaneously or non-spontaneously (B)</p> Signup and view all the answers

    What is the equation for calculating Gibbs free energy?

    <p>$G = H - TS$ (A)</p> Signup and view all the answers

    Which of the following is an example of an exergonic reaction?

    <p>Cellular respiration (A)</p> Signup and view all the answers

    What is the equation for Gibbs free energy?

    <p>G = H - TS (D)</p> Signup and view all the answers

    Which of the following is true about endothermic reactions?

    <p>They require an input of energy (B)</p> Signup and view all the answers

    What is the function of enzymes in chemical reactions?

    <p>To decrease the activation energy (B)</p> Signup and view all the answers

    Which of the following is true about enzyme-substrate association?

    <p>It is temporary (B)</p> Signup and view all the answers

    Which of the following is an example of a catabolic reaction?

    <p>Lipase breaking down lipids (B)</p> Signup and view all the answers

    Which law of thermodynamics states that the total energy of a system plus its environment remains constant?

    <p>First law of thermodynamics (A)</p> Signup and view all the answers

    Which one of the following best describes a closed thermodynamic system?

    <p>A system that cannot exchange matter or energy with its surroundings (A)</p> Signup and view all the answers

    What is the equation for calculating Gibbs free energy?

    <p>G = H - TS (C)</p> Signup and view all the answers

    What is the function of enzymes in metabolic pathways?

    <p>To increase the rate of chemical reactions (A)</p> Signup and view all the answers

    What does a negative enthalpy change indicate in a chemical reaction?

    <p>The reaction is exothermic (A)</p> Signup and view all the answers

    What is entropy?

    <p>A measure of the amount of order or disorder in a system (D)</p> Signup and view all the answers

    Which of the following best describes metabolism?

    <p>The sum of all reactions occurring in cells (B)</p> Signup and view all the answers

    What is the function of enzymes in metabolic pathways?

    <p>To catalyze specific chemical reactions (B)</p> Signup and view all the answers

    Which one of the following is an example of an anabolic reaction?

    <p>Building more complex organic molecules from smaller ones (A)</p> Signup and view all the answers

    What is the definition of potential energy?

    <p>Energy stored in an object due to its position or structure (A)</p> Signup and view all the answers

    Which one of the following best describes a closed thermodynamic system?

    <p>Energy can be exchanged, but matter stays within the system (B)</p> Signup and view all the answers

    Which one of the following is an example of a catabolic reaction?

    <p>The breakdown of large molecules into smaller ones (D)</p> Signup and view all the answers

    Which type of reaction combines smaller molecules to form larger, more complex molecules and requires energy?

    <p>Anabolic reactions (B)</p> Signup and view all the answers

    What is the main function of enzymes in metabolic pathways?

    <p>To catalyze each step in the pathway (B)</p> Signup and view all the answers

    Which one of the following best describes an open thermodynamic system?

    <p>Matter and energy can flow in and out of the system (A)</p> Signup and view all the answers

    What is the first law of thermodynamics?

    <p>Energy of the universe is constant and can be transferred or transformed but not created or destroyed (C)</p> Signup and view all the answers

    Which one of the following forms of energy is converted into chemical energy through photosynthesis?

    <p>Solar energy (A)</p> Signup and view all the answers

    What are the three types of thermodynamic systems?

    <p>Open, closed, and isolated (B)</p> Signup and view all the answers

    Which one of the following best describes Gibbs free energy?

    <p>Gibbs free energy is a measure of the energy available to do work. (C)</p> Signup and view all the answers

    Which one of the following best describes the role of enzymes in chemical reactions?

    <p>Enzymes lower the activation energy required for a reaction. (C)</p> Signup and view all the answers

    Which one of the following best explains enzyme specificity?

    <p>Enzymes can only bind to a specific substrate. (A)</p> Signup and view all the answers

    Which one of the following best describes the lock and key analogy for enzyme specificity?

    <p>The lock represents the substrate and the key represents the product. (D)</p> Signup and view all the answers

    Which one of the following is an example of a spontaneous process?

    <p>Ice melting (A)</p> Signup and view all the answers

    Which one of the following is an example of a non-spontaneous process?

    <p>Plants photosynthesizing (B)</p> Signup and view all the answers

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