High School Biology : Understanding Enzymes
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Example Question #21 : Enzymes
Which of the following is true about enzymes?
They lower the energy of reactants.
They lower the activation energy of a reaction.
They are not catalysts.
They are lipids.
They lower the energy of products.
They lower the activation energy of a reaction.
Enzymes are all proteins, however there are some RNA molecules that have been found to catalyze reactions, but they are termed ribozymes, not enzymes. They speed up reactions by lowering the activation energy of a reaction and do not change the energy states of the reactants or products.
Example Question #11 : Understanding Enzymes
How do enzymes speed up a chemical reaction?
They increase the concentration of one or more of the reactants
They increase the temperature of the reaction, allowing it to occur faster
They lower the activation energy of a reaction
They shift the equilibrium in favor of the products, allowing more product to be created
They tightly bind to the transition state, speeding up the reaction by removing transition states and leaving only products
They lower the activation energy of a reaction
Enzymes work by lowering the activation energy of a reaction, which can occur either by bringing reactants closer together or by destabilizing the transition state. They do not affect the equilibirum of the reaction, meaning they do not affect the amount of reactants or products. They simply increase the speed at which products can be formed by reducing the amount of energy needed to power the reaction.
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