BMS1041 enzymes

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1. The brain enzymes hexokinase has a Km of 0.05 mM and a Vmax on 100mol/min, the intracellular levels of glucose are 5mM, what would you assume the %saturation of the enzyme would be?

  • greater than 60% but less than 80%
  • greater than 0% but less than 20%
  • greater than 80%
  • greater than 40% but less than 60%
  • greater than 20% but less than 40%
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2. By definition enzymes

  • convert ligands to products
  • act as chemical catalysts
  • act as biological catalysts
  • always catalyse irreversible reactions

3. The michaelis menton hyperbolic equation relates v0, km, Vmax and [s], which of these statements best define the equation, parameters and variables

  • v0 = Vmax + [s] / Km x [s], where the variables are v0 and [s] and the parameters are Km and vmax
  • v0 = Vmax x [s] / Km x [s], where the variables are v0 and [s] and the parameters are Km and vmax
  • v0 = Vmax x [s] / Km + [s], where the variables are v0 and [s] and the parameters are Km and vmax
  • v0 = Vmax x [s] / Km + [s], where the variables are v0 and the parameters are [s], Km and vmax
  • v0 = Vmax x [s] / Km + [s], where the variables are v0 and Km and the parameters are Km, [s] and vmax

4. The role of an enzyme is to...

  • lower the free energy (G) of the substrate
  • lower the free energy (G) of the ES complex
  • lower the free energy (G) of the transition states, which can include the ES and EP complexes
  • lower the free energy (G) of the EP complex
  • lower the free energy (G) of the product

5. In one of the practicals you measures the conversion of NAD+ to NADH, why?

  • quartz cuvettes can be used
  • NADH is a common chemical
  • the conversion of NADH to NAD+ can be measured spectrophotometrically at a wavelength of 340nm
  • the conversion of NAD+ to NADH can be measured spectrophotometrically at a wavelength of 340nm
  • NAD+ is a common chemical and simple to purify

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