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Thermodynamics and Free Energy problems


  • 1. If the Standard Gibb's free energy, ?G°, for a reaction is positive then

  • Options
  • A. the products will be favored
  • B. the reactants will be favored
  • C. the concentration of the reactants and products will be equal
  • D. all of the reactant will be converted to product
  • Discuss
  • 2. Reactions that have positive standard free energy changes (?Go> 0) can be made to occur in cells by

  • Options
  • A. coupling them with exergonic reactions via a common intermediate
  • B. manipulating the concentrations of products and reactants such that G/<0
  • C. coupling them to the hydrolysis of ATP
  • D. all of the above
  • Discuss
  • 3. The unfolding of regular secondary structure causes

  • Options
  • A. little increase in the entropy of protein
  • B. large decrease in the entropy of the protein
  • C. no change in the entropy of the protein
  • D. large increase in the entropy of the protein
  • Discuss
  • 4. The Standard Gibb's free energy, ?G°, is

  • Options
  • A. the residual energy present in the reactants at equilibrium
  • B. the residual energy present in the products at equilibrium
  • C. the difference in the residual energy of reactants and products at equilibrium
  • D. the energy required to convert one mole of reactants to one mole of products
  • Discuss
  • 5. During the unfolding reaction of a helix, breakage of each hydrogen bond requires about 2kJ/mol. This implies hydrogen bonds are

  • Options
  • A. much stronger in proteins than in water
  • B. not reformed with water
  • C. slightly weaker in proteins than in water
  • D. slightly stronger in proteins than in water
  • Discuss
  • 6. If the enthalpy change for a reaction is zero, ?G° is equal to

  • Options
  • A. T?S°
  • B. -T?S°
  • C. -?H°
  • D. lnKeq
  • Discuss

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