Ex Phys

35 Questions | Total Attempts: 13

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Study Quizzes & Trivia

Questions and Answers
  • 1. 
    The beginning and ending substrates for the Krebs Cycle are
    • A. 

      Pyruvate-oxaloacetate

    • B. 

      Acetyl-CoA - Citrate

    • C. 

      Oxaloacetate, Acetyl-CoA

    • D. 

      Pyruvate -Citrate

  • 2. 
    • A. 

      Decreased PFK activity

    • B. 

      Inability to perform high intensity short term work

    • C. 

      Inability to transport very long chain fatty acids in the mitochondria

    • D. 

      Increased muscle glycogen

  • 3. 
    Glycolysis takes place
    • A. 

      In the mitochondria

    • B. 

      In the cystol

    • C. 

      In the liver only

    • D. 

      After beta oxidation

  • 4. 
    When post-exercise (prolonged moderate intensity exercise) carbohydrate intake is low:
    • A. 

      Liver glycogen re-synthesis occurs at the expense of protein

    • B. 

      Endurance performance progressively declines

    • C. 

      Fat becomes the limiting factor in performance

    • D. 

      Protein intake must increase

  • 5. 
    Fat can be oxidized in the Krebs Cycle following
    • A. 

      Alpha ketoglutarate

    • B. 

      Anaerobic glycolysis

    • C. 

      Beta oxidation

    • D. 

      Aerobic glycolysis

  • 6. 
    The cori cycle results in the recovery of carbohydrate from which of the following?
    • A. 

      Glucose

    • B. 

      Alanine

    • C. 

      Lactate

    • D. 

      Free fatty acid

  • 7. 
    • A. 

      It promotes the interaction of action and myosin

    • B. 

      It is an activator of phosphorylase

    • C. 

      It inhibits enzymes of beta oxidation

    • D. 

      B and C

  • 8. 
    Most ATP is actually synthesized in the
    • A. 

      Krebs Cycle

    • B. 

      Electron transport Chain

    • C. 

      Glycolysis

    • D. 

      ATP-PC

  • 9. 
    • A. 

      Creatine phosphate

    • B. 

      Glycogen

    • C. 

      Fatty acid

    • D. 

      Protein

  • 10. 
    • A. 

      LDH

    • B. 

      Hormone sensitive lipase

    • C. 

      Membrane bound lipase

    • D. 

      Lipoprotein Lipase

  • 11. 
    One of the primary physiological effects of insulin seems to be
    • A. 

      Increased GLUT-4 activity in muscle

    • B. 

      Reduced glucose uptake by liver

    • C. 

      Increased lipid synthesis in the liver

    • D. 

      Decreased glycogen synthesis in the muscle

  • 12. 
    Protein Contribution to energy production during moderate exercise is estimated to be
    • A. 

    • B. 

      65-70% of the total ATP

    • C. 

      50-60% of the total ATP

    • D. 

      35-50% of the total ATP

  • 13. 
    The complete oxidative degradation of a 6 carbon fat produces approx
    • A. 

      36 moles of ATP

    • B. 

      45 moles of ATP

    • C. 

      686 moles of ATP

    • D. 

      Cannot be determined

  • 14. 
    • A. 

      H+ react with CO2 to produce carbonic acid

    • B. 

      Pyruvate is converted to lactate

    • C. 

      NAD+ is converted to FAD+

    • D. 

      Lactate is converted to Pyruvate

  • 15. 
    • A. 

      Fatty acid intermediates inhibit LDH

    • B. 

      High levels of citrate inhibit PFK

    • C. 

      Lactic acid inhibits PDH

    • D. 

      High energy charge of the cell

  • 16. 
    When a person starts moderate intensity exercise, his oxygen consumption with respect to his/her need will be:
    • A. 

      About equal

    • B. 

      Lower for the first few minutes

    • C. 

      In excess of need for the first few minutes

    • D. 

      Delayed for a long period of time

  • 17. 
    The reaction that results in the formation of water in oxidative metabolism is catalyzed by which enzyme?
    • A. 

      Pyruvate dehydrogenase

    • B. 

      Succinate dehydrogenase

    • C. 

      Cytochrome oxidase

    • D. 

      Citrate synthase

  • 18. 
    When engaged in regular prolonged, moderate intensity (60% max HR reserve) exercise, what would be the effect of a phosphorylase a deficiency?
    • A. 

      You would be unable to complete the activity because of ATP deficiency

    • B. 

      Little effect

    • C. 

      You would fatigue readily due to an inability to use glycogen

    • D. 

      None of the above

  • 19. 
    The factor that most likely determines the utilization of specific nutrients during exercise is the:
    • A. 

      Duration of exercise

    • B. 

      Type of exercise

    • C. 

      Intensity of exercise

    • D. 

      Diet

  • 20. 
    At rest, energy is supplied primarily by:
    • A. 

      The ATP-PC system

    • B. 

      Anaerobic glycolysis with the food fuels being 2/3 fat and 1/3 glucose

    • C. 

      Both the anaerobic glycolysis and ATP-PC system

    • D. 

      Aerobic pathway with the food fuel being principally glycogen

    • E. 

      Aerobic pathways with the food fuel being principally fat

  • 21. 
    During prolonged exercise, how do we maintain the necessary supply of ATP?
    • A. 

      Utilization of glycogen followed by the metabolism of fatty acids

    • B. 

      Utilization of phosphagen stores, followed by glycogen, glucose, and fatty acids

    • C. 

      Utilization of glycogen followed by the utilization of phosphagen stores

    • D. 

      Utilization of glycogen, fatty acids, and proteins

  • 22. 
    Lactate is an end product of
    • A. 

      Anaerobic glycolysis

    • B. 

      The Krebs Cycle

    • C. 

      The electron transport system

    • D. 

      Both a and c

  • 23. 
    When engaged in regular prolonged, high intensity (95% max HR reserve) exercise, what would be the effect of an inability to utilize free fatty acids?
    • A. 

      You would be unable to complete the activity because of ATP deficiency

    • B. 

      Little effect since FFA's do not contribute much to this activity

    • C. 

      You would have to reduce exercise intensity

    • D. 

      None of the above

  • 24. 
    • A. 

      Low pH

    • B. 

      Increased ATP synthesis

    • C. 

      Increased ATP utilization

    • D. 

      Decreased glucose-6 phosphate concentration

  • 25. 
    When one exercises at hight intensity (95% max HR reserve), such as running a 880 yd dash for time, fatigues during the exercise is very common.  Which of the following might help explain the fatigue?
    • A. 

      Lack of availability of creatine phosphate and ATP

    • B. 

      Lowered pH due to the accumulation of fatty acids

    • C. 

      Lowered pH due to the accumulation of lactic acid

    • D. 

      Inhibited glycolysis due to long chain fatty acid intermediates

  • 26. 
    The primary function of the Kreb's Cycle is:
    • A. 

      To complete the oxidation of carbohydrates, fats, and proteins

    • B. 

      To produce ATP via substrate-level phosphorylation

    • C. 

      To prime glycolysis for the production of ATP

    • D. 

      To produce H2O and ATP

  • 27. 
    The key regulatory enzyme for anaerobic glycolysis is
    • A. 

      Isocitrate dehydrogenase

    • B. 

      Phosphorylase

    • C. 

      Hexokinase

    • D. 

      Phosphofructokinase

  • 28. 
    Short term (3 min), very highly intense exercise is predominately supplied ATP by:
    • A. 

      Anaerobic glycolysis

    • B. 

      ETS

    • C. 

      ATP-PC

    • D. 

      Krebs cycle

  • 29. 
    Which of the following is/are true of ATP? I. it is stored in all muscle cells II. it is the immediate source of energy for muscular contraction III. PC + ADP can form ATP + C when catalyzed by the enzyme creatine kinase
    • A. 

      I only

    • B. 

      I and II only

    • C. 

      II and III only

    • D. 

      I, II, and III

  • 30. 
    The key regulatory enzyme for anaerobic glycolysis is
    • A. 

      Isocitrate dehydrogenase

    • B. 

      Phosphorylase

    • C. 

      Hexokinase

    • D. 

      Phosphofrucktokinase

  • 31. 
    When a substance loses and electron, it
    • A. 

      Becomes and acid

    • B. 

      Is reduced

    • C. 

      Becomes a base

    • D. 

      Is oxidized

  • 32. 
    • A. 

      Fats don't provide as much energy

    • B. 

      Fats are used up too quickly

    • C. 

      Fats require more oxygen for oxidation

    • D. 

      Fats inhibit carbohydrate metabolism

  • 33. 
    The reformation of PC occurs
    • A. 

      Only during maximal exercise

    • B. 

      Only during low exercise states

    • C. 

      During recovery from exercise

    • D. 

      Only after creatine supplementation

  • 34. 
    The largest store of potential energy found in the body is in:
    • A. 

      Glycogen

    • B. 

      Fat

    • C. 

      Creatine phosphate

    • D. 

      ATP

  • 35. 
    Before pyruvic acid can enter the Krebs Cycle, it loses CO2 because it is a 
    • A. 

      3-carbon molecule and must be converted to acetyl-CoA which is a 2-carbon molecule

    • B. 

      4-carbon molecule and must be converted to lactic acid which a 3-carbon molecule

    • C. 

      3-carbon molecule and must be converted to acetyl-CoA which is a 4-carbon molecule

    • D. 

      None of the above