An enzyme is a:

a. biological catalyst that increases the concentration of the products.

b. biological catalyst that increases the concentration of the reactants.

c. chemical that is used in a reaction, after which it can no longer be used by the cell.

d. biological catalyst that works by bringing its substrates closer to their transition states.

Video transcript

Hey, everyone. Let's take a look at this question together. How do enzymes increase the rate of chemical reactions? Is it answer choice? A by altering the structure of the reactants. Answer choice B by changing the active site for the substrate. Answer choice C by lowering the activation energy required for the reaction or answer choice D by changing the Ph condition. Let's work this problem out together to try to figure out which of the following answer choices explains how enzymes increase the rate of chemical reactions. So in order to solve this question, we have to recall what we have learned about enzymes and how they increase the rate of chemical reactions. And we know that enzymes are a type of catalyst, which a catalyst works to lower the activation energy that is required for the reaction to proceed. And it does so by binding to the substrate which facilitates the formation or the breaking of chemical bonds. Therefore, enzymes increase the rate of chemical reactions by lowering the activation energy that is required for the reaction to take place, which increases the rate of chemical reactions. So answer choice C is the correct answer. And all other answer choices are incorrect. I hope you found this video to be helpful. Thank you and goodbye.