BIO 361 Biology Practice Exam: Trivia Quiz

27 Questions | Total Attempts: 625

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BIO 361 Biology Practice Exam: Trivia Quiz

How much do you know about biology? Biology is a pure science that concentrates on the research of life and living organisms, including their structure, function, development, interactions, evolution, distribution, cells, and nomenclature. The field's scope is extensive, and it is separated into many specialized disciplines such as anatomy, physiology, ethology, and genetics. This quiz will explain whatever you need to know about biology.


Questions and Answers
  • 1. 
    Why does the rate of glucose transport via Glut-1 only increase up to a certain level, but then stabilize even when external glucose concentration increases?
    • A. 

      Glut-1 transporters become exhausted and stop working.

    • B. 

      All available transporters are working at their maximal rate.

    • C. 

      The driving force for glucose movement has levelled off.

  • 2. 
    How could a cell increase its maximum rate of glucose transport?
    • A. 

      Reduce the total number of Glut-1 transporters.

    • B. 

      Reduce internal glucose concentration to increase the driving force for glucose movement.

    • C. 

      Increase internal glucose concentration to increase the driving force for glucose movement.

    • D. 

      Increase the total number of Glut-1 transporters.

  • 3. 
    If you measured desaturase enzyme activity in a goldfish living at 10 degrees Celsius and compared it to desaturase enzyme activity in a goldfish living at 30 degrees Celsius you would expect:
    • A. 

      Desaturase activity to be similar

    • B. 

      Desaturase activity to be higher in the warm fish

    • C. 

      Desaturase activity to be higher in the cold fish

  • 4. 
    Which of the following changes will result in an increase in membrane fluidity?
    • A. 

      Increasing the temperature

    • B. 

      Increasing membrane unsaturation

    • C. 

      Decreasing membrane unsaturation

    • D. 

      Both a and b

    • E. 

      Both a and c

  • 5. 
    Which of the following changes will result in an increase in membrane fluidity?
    • A. 

      Increasing the temperature

    • B. 

      Increasing membrane unsaturation

    • C. 

      Decreasing membrane unsaturation

    • D. 

      Both a and b

    • E. 

      Both a and c

  • 6. 
    When comparing an Antarctic fish (body temperature ~1 degree Celsius) and a bird (body temperature ~41 degrees Celsius) you would expect:
    • A. 

      The Antarctic fish to have more unsaturated membrane fatty acids

    • B. 

      The bird to have more unsaturated membrane fatty acids

    • C. 

      It is impossible to predict which one would have more unsaturated membrane fatty acids.

  • 7. 
    If you measured the membrane fluidity of two artificial bilayers, one containing cholesterol, and one lacking cholesterol:
    • A. 

      The relative fluidity of the bilayers would depend on the temperature of measurement.

    • B. 

      The cholesterol containing bilayer would have higher fluidity.

    • C. 

      The cholesterol containing bilayer would have lower fluidity.

  • 8. 
    ___________ is the ability to do work.
    • A. 

      Force

    • B. 

      Energy

    • C. 

      Potential

    • D. 

      Power

  • 9. 
    Glucose exhibits a(n) _______________ gradient across the cell membrane
    • A. 

      Electrochemical

    • B. 

      Steep

    • C. 

      Chemical

    • D. 

      Electrical

  • 10. 
    As a general rule, lipid-soluble molecules cross membranes by ______________.
    • A. 

      Active transport

    • B. 

      Passive diffusion

    • C. 

      Facilitated diffusion

    • D. 

      All of the above

  • 11. 
    A(n) _______________ facilitates diffusion by binding to its substrate and undergoing a conformational change to transport the substrate across the membrane.
    • A. 

      Permease

    • B. 

      Ion channel

    • C. 

      Porin

    • D. 

      Voltage-gated channel

  • 12. 
    Which of the following statements is true concerning secondary active transporters?
    • A. 

      An exchanger/antiporter will always be electroneutral

    • B. 

      Electrogenic carriers generate a charge difference across the membrane

    • C. 

      A symporter can bind only one particle

    • D. 

      The direction in which charged particules are transported across the the membrane does not affect the electrical gradient

  • 13. 
    The equilibrium potential and the reversal potential for a cell are interchangeable terms, assuming only one ion is being considered.
    • A. 

      True

    • B. 

      False

  • 14. 
    The Goldman equation is used to calculate the _____________ of a cell.
    • A. 

      Action potential

    • B. 

      Resting membrane potential

    • C. 

      Reversal potential

    • D. 

      All of the above

  • 15. 
    The main reason the interior of the cell is electronegative at rest is because
    • A. 

      The membrane is more permeable to Na+ than to any other ion

    • B. 

      The Na+/K+ pump is electroneutral

    • C. 

      The membrane is more permeable to K+ than to any other ion

    • D. 

      The interior of the cell contains a much higher concentration of Cl-

  • 16. 
    Compared to the outside of the cell membrane, the inside of the resting cell membrane is typically:
    • A. 

      Electrically neutral

    • B. 

      Extremely variable

    • C. 

      Negatively charged

    • D. 

      Positively charged

    • E. 

      Positively charged whenever the sodium pump is active.

  • 17. 
    Calculate the equilibrium potential for Na+ when the intracellular concentration of Na+ is 15mM and the extracellular concentration of Na+ is 145 mM.  The temperature is 37C (or 310K).  Note the Faraday's constant is 23,062 cal/V. mol, and the gas constant is 1.9872 cal/K. mol
    • A. 

      +60.6mV

    • B. 

      +60.6V

    • C. 

      0.0072V

    • D. 

      -60.6V

    • E. 

      -6-.6mV

  • 18. 
    Which of the following would make the membrane potential of a neuron less negative than its resting potential?
    • A. 

      Depolarization

    • B. 

      Hyperpolarization

    • C. 

      Repolarization

    • D. 

      Positively charged ions moving out of the cell

    • E. 

      Negatively charged ions moving into the cell

  • 19. 
    Several molecules of neurotransmitter arrive at the cell membrane of a vertebrae motor neuron dendrite and bind to several of the ligand-gated K+ channels there, stimulating them to open.  What will happen next?
    • A. 

      No graded potential will be generated because the cell membrane will hyperpolarize.

    • B. 

      K+ ions will leave the cell, hyperpolarizing the cell membrane.

    • C. 

      An excitatory graded potential will be generated.

    • D. 

      An action potential will be generated.

    • E. 

      K+ ions will enter the cell, depolarizing the cell membrane.

  • 20. 
    Which of the following will happen when a subthreshold excitatory stimulus reaches the axon hillock?
    • A. 

      All of the voltage-gated Na+ channel will open, depolarizing the cell membrane.

    • B. 

      No voltage gated sodium channels will open and the greater potential will continue to travel into the axon, decreasing in magnitude until it dies away completely

    • C. 

      Only some of the voltage gated sodium channels will open, so it will only generate a small action potential

    • D. 

      Only some of the voltage gated sodium channels will open, so it will only generate a graded potential

    • E. 

      An action potential will be generated

  • 21. 
    At the axon hillock, which of the following is most likely to trigger an action potential?
    • A. 

      One excitatory subthreshold graded potential that arrives at exactly the same time as a second subthreshold excitatory graded potential.

    • B. 

      One excitatory threshold graded potential that arrives at exactly the same time as one inhibitory graded potential.

    • C. 

      One excitatory suprathreshold graded potential that arrives just one millisecond after two inhibitory graded potential

    • D. 

      One excitatory subthreshold graded potential that arrives several seconds after another subthreshold excitatory graded potential.

    • E. 

      One excitatory subthreshold graded potential.

  • 22. 
    The axon hillock is incapable of generating an action potential while...
    • A. 

      Its cell membrane is hyperpolarized

    • B. 

      It is in the after hyperpolarization phase of an action potential

    • C. 

      It is in the relative refractory period

    • D. 

      It is in the absolute refractory period

    • E. 

      It is stimulated by a suprathreshold graded potential

  • 23. 
    In a squid giant axon, the length of the relative refractory period is mainly determined by ...
    • A. 

      The binding of neurotransmitters to the voltage gated sodium channels

    • B. 

      The magnitude of the graded potential that stimulated the action potential.

    • C. 

      The length of time that the voltage gated potassium channel remain open

    • D. 

      The timing of the activation gate of the voltage gated sodium channels

    • E. 

      The timing of the inactivation gate of the voltage gated sodium channels

  • 24. 
    In a squid giant axon, closing of the inactivation gates of the voltage gated Na+ channel ends the ...
    • A. 

      Depolarization phase of an action potential

    • B. 

      Repolarization phase of an action potential

    • C. 

      Afterhyperpolarization phase of an action potential

    • D. 

      Absolute refractory period

    • E. 

      Relative refractory period

  • 25. 
    Why can action potentials be transmitted over long distances while graded potentials can only be transmitted over relatively short distances?
    • A. 

      Action potentials are self-propagating while graded potentials are not

    • B. 

      Charged ions leak across the membrane when graded potentials are conducted in a neuron, but not when action potentials are conducted

    • C. 

      Action potentials travel only by ions moving through ion channels while graded potentials travel by electronic current spread

    • D. 

      Action potentials travel by electrotonic current spread while graded potentials travel only by ions moving through ion channels

    • E. 

      Action potentials are always larger in magnitude than graded potentials so they can further without dying away

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