Metabolic Pathway Regulation Mechanisms
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Metabolic Pathway Regulation Mechanisms

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Questions and Answers

What happens to the activity of glycogen phosphorylase kinase, glycogen phosphorylase, and hormone-sensitive lipase of adipose tissue in their dephosphorylated form?

  • They are activated
  • They degrade
  • They are inactivated (correct)
  • They remain unchanged

    • What is the role of insulin in enzyme synthesis in the fed state?

  • Decrease synthesis of key enzymes
  • Increase the synthesis of key enzymes (correct)
  • Enhance enzyme degradation
  • Activate catabolic enzymes

    • How do changes in enzyme synthesis affect enzyme molecules according to the text?

  • Increase or decrease the number of enzyme molecules (correct)
  • Change their structure
  • Alter their stability
  • Accelerate their activity

    • Why does the liver become a net consumer of glucose after a meal containing carbohydrates?

    <p>Increased activity of insulin-independent glucose transporter</p> Signup and view all the answers

    Which mechanism primarily involves the regulation of enzyme synthesis through transcription?

    <p>Induction-repression of enzyme synthesis</p> Signup and view all the answers

    What allows the liver to process and distribute dietary nutrients effectively?

    <p>Passage of absorbed nutrients through the hepatic portal vein</p> Signup and view all the answers

    Which enzyme is allosterically inhibited by fructose 2,6-bisphosphate?

    <p>Fructose 1,6-bisphosphatase</p> Signup and view all the answers

    In the well-fed state, regulatory mechanisms ensure that available nutrients are captured as which of the following?

    <p>Glycogen, TAG, and protein</p> Signup and view all the answers

    Which enzymes are mostly in the dephosphorylated form and active during the absorptive state?

    <p>Covalently regulated enzymes</p> Signup and view all the answers

    Which type of modification involves the addition or removal of phosphate groups from specific residues of proteins?

    <p>Covalent modification</p> Signup and view all the answers

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