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 'anabolic'.

• releases energy 
• 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?

• Chemical reactions only occur in the presence of light. 
• Chemical reactions always result in a increase in the number of atoms. 
• Chemical reactions play a role in many important biological processes. 
• Chemical reactions always result in a decrease in entropy. 
• Chemical reactions only occur at a specific temperature. 

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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 TRUE concerning the Gibbs free energy, ΔG = ΔH – TΔS?

• When ΔS = 0 the reaction has reached equilibrium 
• entropy is associated with the amount of heat exchanged with the environment 
• When ΔG > 0 the reaction is called non-spontaneous 
• Tis the temperature in degrees Fahrenheit 
• ΔH is the change in entropy 

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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?

• Thermodynamics determines the direction a reaction will proceed under specific conditions. 
• The second law of thermodynamics states that the total entropy of a closed system will always increase. 
• Kinetics describes the rate at which a reaction approaches equilibrium. 
• In general, more disorder means less entropy. 
• Enzymes alter the reaction kinetics by lowering the activation energy. 

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