Multiple Choice
Which of the following statements is true about enzymes in catalysis?
31. Catalysis in Organic Reactions
Introduction to Catalysis
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How do enzymes act as biological catalysts in chemical reactions?
A
By permanently binding to the substrates
B
By increasing the activation energy required for the reaction
C
By changing the equilibrium position of the reaction
D
By providing an alternative reaction pathway with a lower activation energy
Verified step by step guidance1
Understand that enzymes are proteins that act as biological catalysts, meaning they speed up chemical reactions without being consumed in the process.
Recognize that enzymes do not permanently bind to substrates; instead, they temporarily form an enzyme-substrate complex, facilitating the conversion of substrates into products.
Identify that enzymes lower the activation energy of a reaction, which is the energy barrier that must be overcome for a reaction to proceed. This is achieved by providing an alternative reaction pathway.
Clarify that enzymes do not change the equilibrium position of a reaction. They only speed up the rate at which equilibrium is reached by lowering the activation energy.
Conclude that the correct mechanism by which enzymes act as catalysts is by providing an alternative reaction pathway with a lower activation energy, thus increasing the reaction rate.
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