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Allosteric Kinetics quiz

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  • What shape does the kinetics plot of an allosteric enzyme typically display?
    Allosteric enzymes display a sigmoidal (S-shaped) curve on a kinetics plot.
  • How does the kinetics plot of a Michaelis Menten enzyme differ from that of an allosteric enzyme?
    Michaelis Menten enzymes show a rectangular hyperbola, while allosteric enzymes show a sigmoidal curve.
  • What variable represents the substrate concentration at half-maximal velocity for allosteric enzymes?
    The substrate concentration at half-maximal velocity for allosteric enzymes is denoted as K0.5.
  • Does the Michaelis constant (Km) apply to allosteric enzymes?
    No, Km only applies to Michaelis Menten enzymes; allosteric enzymes use K0.5 instead.
  • Can the Michaelis-Menten equation be used for allosteric enzymes?
    No, the Michaelis-Menten equation does not apply to allosteric enzymes.
  • What effect describes the sudden activation of allosteric enzymes at a certain substrate concentration?
    This is called the threshold effect, where allosteric enzymes become active only above a specific substrate concentration.
  • How do allosteric enzymes respond to changes in substrate concentration at very low levels?
    At very low substrate concentrations, allosteric enzymes show little to no activity and are not sensitive to changes.
  • What happens to allosteric enzyme activity once the threshold substrate concentration is reached?
    Once the threshold is reached, allosteric enzymes rapidly increase activity and approach Vmax quickly.
  • How does the range of substrate concentration for reaching Vmax compare between allosteric and Michaelis Menten enzymes?
    Allosteric enzymes reach Vmax within a narrow substrate concentration range, while Michaelis Menten enzymes do so over a wider range.
  • What does the Lineweaver-Burk plot look like for allosteric enzyme kinetic data?
    Allosteric enzyme kinetic data does not form a straight line on a Lineweaver-Burk plot.
  • Can the Lineweaver-Burk equation be used for allosteric enzymes?
    No, the Lineweaver-Burk equation does not apply to allosteric enzymes.
  • How can biochemists easily identify allosteric enzymes using kinetic plots?
    Biochemists can identify allosteric enzymes by their sigmoidal curve in kinetics plots and non-linear data in Lineweaver-Burk plots.
  • What regulatory advantage does the threshold effect provide for allosteric enzymes?
    The threshold effect allows cells to use allosteric enzymes as an on/off switch for metabolic regulation.
  • How do Michaelis Menten enzymes behave at low substrate concentrations compared to allosteric enzymes?
    Michaelis Menten enzymes are more sensitive and active at low substrate concentrations, unlike allosteric enzymes.
  • What is the main difference in substrate sensitivity between allosteric and Michaelis Menten enzymes?
    Allosteric enzymes are insensitive at low substrate concentrations but become highly sensitive above the threshold, while Michaelis Menten enzymes are always sensitive.