Metabolism: Anabolic and Catabolic Reactions Overview
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Questions and Answers

What is the purpose of allosteric effectors in enzyme regulation?

  • Generate phosphorylated intermediates for energy transfer
  • Bind to the allosteric site to inhibit enzyme function (correct)
  • Bind to the active site to activate enzyme function
  • Induce negative feedback loops in metabolic pathways
  • Which process involves combining a positive ∆G reaction with a negative ∆G reaction to yield a net negative ∆G for the combined reactions?

  • Redox reactions
  • Reaction coupling (correct)
  • Feedback inhibition
  • Allosteric regulation
  • What is the main role of NADH (or NADPH) in metabolism?

  • Inhibit enzymes in metabolic pathways
  • Promote positive ∆G reactions
  • Transfer high energy electrons between molecules (correct)
  • Generate phosphorylated intermediates
  • In reaction coupling, what is the primary role of ATP?

    <p>Yield a negative ∆G for coupled reactions</p> Signup and view all the answers

    Which feature distinguishes anabolic reactions from catabolic reactions?

    <p>Anabolic reactions consume ATP</p> Signup and view all the answers

    What is the function of negative feedback loops in metabolic pathways?

    <p>Inhibit enzymes at the beginning of a pathway</p> Signup and view all the answers

    Which of the following statements accurately describes anabolic reactions?

    <p>They synthesize molecules with more bonds and store energy</p> Signup and view all the answers

    According to the Second Law of Thermodynamics, what happens during any energy transformation?

    <p>Energy is lost through entropy, making it unavailable for work</p> Signup and view all the answers

    What is the relationship between free energy (G) and enthalpy (H) and entropy (S)?

    <p>G = H - S</p> Signup and view all the answers

    How does the change in free energy ($\Delta$G) relate to anabolic and catabolic reactions?

    <p>Positive $\Delta$G indicates an anabolic reaction, while negative $\Delta$G indicates a catabolic reaction</p> Signup and view all the answers

    What is the primary role of enzymes in chemical reactions?

    <p>To reduce the activation energy of a reaction</p> Signup and view all the answers

    How do enzymes interact with their substrates?

    <p>Substrates interact with enzymes at the active site, forming an enzyme-substrate complex with a close interaction through induced fit</p> Signup and view all the answers

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