Which of the following is a false statement regarding enzymes? a. Enzymes are proteins that speed up metabolic reactions; b. Enzymes have specific substrates; c. Enzymes supply ATP to their substrates; d. An enzyme may be used many times.

Video transcript

Hi everyone. Let's look at our next problem. The rate of a chemical reaction is increased by and let's notice, looking at our choices. That choice D. Is all of the above. So there's a chance that all of our choices could be correct. So, looking for what will increase the rate of a chemical reaction. Um One thing to remember is that for a chemical reaction to go forward we have an activation energy which is the energy that needs to be put in to make the reaction start to take place. So as you see that little graph with the activation energy that you have to get past before the reaction will take place. So let's keep it out of mind. The choice A says an increase in temperature while an increase in temperature is going to lead to an increase in the number of molecules of the reactant that have energy greater than or equal to this activation energy. And therefore with more molecules at that activation energy, the rate of the reaction will increase. More molecules will be able to go forward with the reaction. So this is correct. Increase in temperature will increase the rate of a chemical reaction. Choice B says the presence of a catalyst. Well, a catalyst lowers the activation energy of a given reaction. So, with the activation energy lowered the rate of the chemical reaction will increase. So choice be also correct. Well, if I were on a test um and want to go quickly, that would tell me right away that our answer is all of the above. Since I've got more than one correct answer. But since I'm being thorough here, we will look at choice C. To make sure Joyce C. Says an increase in the substrate concentration. Well, substrate being um the molecule that an enzyme binds to to catalyze a reaction. So if we imagine our enzyme and a substrate, if there's more substrate around at a higher concentration, it will bind with the enzyme at a faster rate and causing that reaction to take place in a quicker at a faster rate. Sorry. So the increase in substrate concentration will cause a chemical reactions rate to increase because there's more substrate around to bind with that enzyme. However, one quick note is that that will eventually level off as all of the enzyme President gets saturated with that high amount of substrate. So just a little note to go with that. But as we can see A B and C. All correct all things that increase the rate of a chemical reaction. So our answer choices D all of the above. Hope to see you in the next video