| 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 |
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Answer: (d).slightly stronger in proteins than in water
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| 22. | If the enthalpy change for a reaction is zero, ΔG° is equal to |
| a. | TΔS° |
| b. | -TΔS° |
| c. | -ΔH° |
| d. | lnKeq |
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Answer: (b).-TΔS°
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| 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 |
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Answer: (d).all of the above
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| 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 |
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Answer: (d).the energy required to convert one mole of reactants to one mole of products
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| 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! |
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Answer: (b).the reactants will be favored
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