Knpe 125 Unit 1 Test

57 Questions | Total Attempts: 11

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Knpe 125 Unit 1 Test

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Questions and Answers
  • 1. 
    Which of the following is the correct equation for the physiological flow model?
    • A. 

      Flow=Inflow-Outflow

    • B. 

      Flow = Gradient (P) x Conductance

    • C. 

      Flow = Gradient (P)/Conductance

    • D. 

      Flow = Gradient (P) x Resistance

  • 2. 
    Assuming constant high conductance, what would happen to flow of sodium into cell if the pressure of sodium of the cell decreased from 20 to 16 while the pressure of sodium on the inside of the cell decreased from 14 to 4?
    • A. 

      Flow would increase

    • B. 

      Flow would decrease

    • C. 

      Flow would not change

  • 3. 
    Identify the example below that represents an increase in conductance
    • A. 

      Placing an NFL lineman in the doorway and telling him to stop people from entering

    • B. 

      A highway decreasing lanes of traffic from 3 to 1

    • C. 

      Increasing the number of bouncers at the front doors to a bar

    • D. 

      The number of people trying to enter a building doubling from 250 to 500

  • 4. 
    If the mass, or pool, of substance y is increasing, which of the following is likely to be true?
    • A. 

      P for inflow is decreasing

    • B. 

      P for outflow is increase

    • C. 

      Conductance for inflow is increasing

    • D. 

      Conductance for outflow is increasing

    • E. 

      None of the above would be expected to accompany an increase in the mass of substance y.

  • 5. 
    Which of the following is the major difference between feedback and feed forward control?
    • A. 

      Only feedback control alters regulated variables 

    • B. 

      Only feed forward control alters regulated variables 

    • C. 

      Only feedback control utilizes a controller

    • D. 

      Only feedback control directly responds to changes in regulated variables

  • 6. 
    Which of the physiological models presented in KNPE 125 do not contribute significantly to the events between two neurons that lead to depolarization of the post-synaptic neuron?
    • A. 

      Model of flow

    • B. 

      Conservation of mass model

    • C. 

      Receptor Mediated Signalling

    • D. 

      None of the above models are involved

    • E. 

      All of the above models are involved

  • 7. 
    Of the following examples, only ______ could be defined as exergonic
    • A. 

      Breaking down ATP (ATP Hydrolysis)

    • B. 

      Producing ATP (ATP synthesis)

    • C. 

      Lighting a match

    • D. 

      Both a and c are exergonic

    • E. 

      Both b and c are exergonic

  • 8. 
    Which of the following reactions would typically require the most activation energy
    • A. 

      Exergonic

    • B. 

      Exergonic reactions catalyzed by an enzyme

    • C. 

      Endergonic

    • D. 

      Endergonic reaction catalyzed by an enzyme

    • E. 

      All of these reactions typically require the same amount of activation energy

  • 9. 
    Which of the following is true regarding enzyme function
    • A. 

      Enzymes change chemical reactions from exergonic to endergonic.

    • B. 

      Enzymes speed the rate of a reaction by increasing availability of substrate

    • C. 

      Enzymes speed the rate of a reaction by increasing activation energy

    • D. 

      Each individual enzyme is a small protein that speeds the rate of a wide range of chemical reactions

    • E. 

      None of the above is true

  • 10. 
    Which of the following would decrease the rate of the reaction
    • A. 

      Increasing the number of products

    • B. 

      Decreasing the number of enzymes

    • C. 

      Decreasing the number of substrates

    • D. 

      All of the above

    • E. 

      None of the Above

  • 11. 
    When an enzyme is “saturated”, the number of substrate present Is _____ the number of enzymes
    • A. 

      Less than

    • B. 

      Equal to

    • C. 

      Greater than

    • D. 

      Both a and b

    • E. 

      Both b and c

  • 12. 
    Which of the following is/are true regarding membrane structure and function?
    • A. 

      Membranes are made up of phospholipids that have a hydrophilic tail and a hydrophobic head.

    • B. 

      Membranes are impermeable to water soluble substances such as carbohydrates and protein

    • C. 

      Fat soluble substances can only diffuse across a membrane when specific channels or transporters are present 

    • D. 

      Both a and b are true

  • 13. 
    In which of the following processes do ligand gated channels pay a direct and essential role?
    • A. 

      Conduction of an action potential down an axon

    • B. 

      Release of neurotransmitters from a pre-synaptic neuron

    • C. 

      Initiation of an action potential in a post synaptic neuron

  • 14. 
    If the rate of diffusion for substance z increased linearly with increasing concentration gradient, diffusion of substance z is an example of
    • A. 

      Simple diffusion

    • B. 

      Facilitated Diffusion

    • C. 

      Active Transport

    • D. 

      Co-transport

  • 15. 
    In which of the following types of transport is ATP breakdown directly involved in?
    • A. 

      Active Transport

    • B. 

      Co-Transport

    • C. 

      Counter-Transport

    • D. 

      All of the above directly require the breakdown of ATP

  • 16. 
    Where does transcription occur
    • A. 

      Cytoplasm

    • B. 

      Endoplasmic Reticulum

    • C. 

      Golgi Apparatus

    • D. 

      Nucleoplasm

  • 17. 
    Which of the following contains the correct order of the events of translation
    • A. 

      Initiation, Elongation, Termination

    • B. 

      Elongation, Initiation, Termination

    • C. 

      Elongation, Termination, Initiation

    • D. 

      Initiation, Termination, Elongation

  • 18. 
    ___ type of RNA binds to the 40s subunit, whereas _____ type of RNA brings amino acids to the 60s subunit:
    • A. 

      MRNA; tRNA

    • B. 

      TRNA; rRNA

    • C. 

      RRNA; mRNA

    • D. 

      MRNA; rRNA

  • 19. 
    Which of the following represents the path a newly formed protein would take as it travelled from membrane
    • A. 

      Mitochondria, ER, membrane

    • B. 

      ER, mitochondria, membrane

    • C. 

      ER, Golgi Apparatus, Membrane

    • D. 

      ER, Golgi Apparatus, Mitochondria, Membrane

  • 20. 
    Identify the example below that describes how, according to the flow model, exercise training improves performance.
    • A. 

      More enzymes increase substrate availability

    • B. 

      Fewer enzymes decrease substrate availability

    • C. 

      More enzymes increase conductance

    • D. 

      More substance decreases resistance

  • 21. 
    What is the difference between the Nernst and Goldman equation?
    • A. 

      Only the Nerst equation considers the electrical charge across a membrane

    • B. 

      Only the Goldman equaiton considers concentration gradients

    • C. 

      Only the Goldman equation takes into consideration membrane permeability

    • D. 

      Only the Nerst equation considers the contribution of the Na+/K+ pump

  • 22. 
    Which of the following statements is NOT true of “leak” channels as they relate to membrane potential?
    • A. 

      Leak channels allow both Na+ and K+ to diffuse freely across cell membranes

    • B. 

      Leak channels are the main reason that K+ contributes more to membrane potential than Na+

    • C. 

      Leak channels allow 1000 times more Na+ to diffuse than K+

    • D. 

      Leak channels are integral membrane proteins

  • 23. 
    Opening a K+ channel located within the membrane of a resting neural cell would cause that neurons membrane potential to become ____.
    • A. 

      More positive

    • B. 

      More negative

    • C. 

      Opening a K+ channel would have no impact on membrane potential

  • 24. 
    During depolarization, the membrane potential becomes more ____ because _____ channels open.
    • A. 

      Positive, Sodium (Na+)

    • B. 

      Positive, Potassium (K+)

    • C. 

      Negative, Sodium (Na+)

    • D. 

      Negative, Potassium (K+)

  • 25. 
    Multiple Sclerosis (MS) is a disease that slowly prevents the nervous system from conducting action potentials. Why does MS have this effect?
    • A. 

      The body’s immune system attacks and damages myelin sheath decreasing the rate of action potential conduction.

    • B. 

      The body’s immune system attacks and damages the myelin sheath increasing the rate of the action potential conduction

    • C. 

      With MS, the nodes of Ranvier are damaged and allow action potentials to diffuse out of the axon stopping conduction

    • D. 

      All of the above are true

    • E. 

      Only a and b are true

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