The Feed/fast Cycle

18 Questions

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Biochemistry Quizzes & Trivia

SGUBiochemistrySpring 2010Lecture 61: Dr L D

Questions and Answers
  • 1. 
    After a typical high carbohydrate meal, the pancreas is stimulated to release ____ p1
  • 2. 
    The ____ is the first tissue to have the opportunity to use dietary glucose p2
  • 3. 
    ____ ________, which catalyzes the first step in gluconeogenesis is inactive due to low levels of acetyl CoA p2
  • 4. 
    Long-term effects: insulin induces the synthesis of _____ and pyruvate kinase p2
  • 5. 
    The ____ cycle is interrupted in the well-fed state. p3
  • 6. 
    Acetyl CoA is used for fatty acid synthesis and ____ synthesis.  Both synthetic pathways are activated by insulin p3
  • 7. 
    The high ______ ratio increases the concentration of fructose 2,6-bisphosphate to ____ glycolysis in the well-fed state p5
    • A. 

      Glucagon/insulin, activate

    • B. 

      Glucagon/insulin, inactivate

    • C. 

      Insulin/glucagon, activate

    • D. 

      Insulin/glucagon, inactivate

  • 8. 
    Elevated insulin levels lead to _____ and therefore ______ of hormone-sensitive lipase.
    • A. 

      Phosphorylation / activation

    • B. 

      Phosphorylation / inactivation

    • C. 

      Dephosphorylation / activation

    • D. 

      Dephosphorylation / inactivation

  • 9. 
    In the well-fed state, ___ is the primary source of energy for the muscle p6
  • 10. 
    Except in conditions of starvation, ____ is the only fuel for the brain p6
  • 11. 
    Red blood cells can use only glucose as fuel because they lack _________ p6
  • 12. 
    During fasting, the liver converts fatty acids into ___ ____ which are released into the blood.
  • 13. 
    Stored fuels suffice for caloric needs for 3 months, but _____ reserves are gone in one day. p7
  • 14. 
    ____ plays an essential role in maintaining blood glucose levels during overnight and prolonged fasting p8
  • 15. 
    In the fasting state, the liver gets energy by oxidizing ___ ___ released from adipose tissue p8
  • 16. 
    As long as ketone body levels are maintained high by hepatic fatty acid oxidation, ther eis less need for glucose, less need for gluconeogenic amino acids, and consequently, less need for breaking down _____. p9
  • 17. 
    In the fasting state, uptake of fatty acids is
    • A. 


    • B. 


  • 18. 
    In starvation periods longer than two to three weeks, plasma ___ ___ may supply as much as 2/3 of the energy requirements of the brain p11