Topic 6: Enzymes Reactions and Thermodynamics

Enzyme functions, substrate binding, and energy changes in reactions.

Energy Terms and Their Categories

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Which one of the following energy requirement categories correspond to the energy term 'ΔG°′ < 0'.

• A. releases energy 
• B. requires energy input 

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True/False Statements on Chemical Reactions

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Which one of the following statements is TRUE of chemical reactions?

• A. Chemical reactions only occur in living organisms. 
• B. Chemical reactions always involve a change in the chemical composition of substances. 
• C. Chemical reactions only occur in the presence of light. 
• D. Chemical reactions only occur at a specific temperature. 
• E. Chemical reactions only occur when energy is added. 

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True/False Statements on Gibbs Free Energy (ΔG = ΔH - T ΔS)

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Which one of the following statements is FALSE about the Gibbs free energy, ΔG = ΔH – TΔS?

• A. free energy is associated with a state of disorder, randomness, or uncertainty 
• B. When ΔG < 0 the reaction is calledspontaneous 
• C. ΔH is the change in enthalpy 
• D. Tis the temperature in degrees Kelvin 
• E. When ΔG = 0 the reaction has reached equilibrium 

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True/False Statements on Thermodynamics vs. Kinetics

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Which one of the following statements is FALSE concerning thermodynamics and kinetics?

• A. Dehydration reactions often lead to a decrease in the entropy of the products. 
• B. The equilibrium constant (K′_eq) is related to the standard change in free energy (ΔG°′) of a reaction. 
• C. A reaction is spontaneous if the standard change in free energy (ΔG°′) is negative. 
• D. Enzymes change the reaction thermodynamics. 
• E. Thermodynamics is determined by the combination of enthalpy and entropy of a reaction. 

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