E-PolyLearning

21. During the unfolding reaction of a helix, breakage of each hydrogen bond requires about 2kJ/mol. This implies hydrogen bonds are
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
View Answer Report Discuss 50-50!
Answer: (d).slightly stronger in proteins than in water

22. If the enthalpy change for a reaction is zero, ΔG° is equal to
a. TΔS°
b. -TΔS°
c. -ΔH°
d. lnKeq
View Answer Report Discuss 50-50!
Answer: (b).-TΔS°

23. Reactions that have positive standard free energy changes (ΔGo> 0) can be made to occur in cells by
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
View Answer Report Discuss 50-50!
Answer: (d).all of the above

24. The Standard Gibb's free energy, ΔG°, is
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
View Answer Report Discuss 50-50!
Answer: (d).the energy required to convert one mole of reactants to one mole of products

25. If the Standard Gibb's free energy, ΔG°, for a reaction is positive then
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
View Answer Report Discuss 50-50!
Answer: (b).the reactants will be favored

Page 5 of 6