Refer to the graph in problem 16.45 to determine if the reaction rate in each condition will be at the optimum rate or not.
a. trypsin, pH 5.0

Question

Refer to the graph in problem 16.45 to determine if the reaction rate in each condition will be at the optimum rate or not.

a. trypsin, pH 5.0

Accepted Answer

Welcome back everybody. The next problem we have says using the provided graph identify which of the following conditions is closest to the optimum reaction rate, select the best answer. And then we have a graph of reaction rate on the Y axis, Ph on the X axis with three different color curves representing three different enzymes. And we have four answer choices A through D with different PH levels for each of the enzymes. So when we have a graph like this, it's looking at which Ph condition provides the best reaction rate. So we would say that that Ph where the rate is highest is the optimum reaction conditions. So we have three different enzymes. So we have a blue line for enzyme X. So let's look for the peak of the reaction rate curve. So we'll put a little dot where it is and that reaction rate is just a little above five. We don't have units there. I'm not sure what units that is. And we see that that Ph is between six and eight past it's above seven. So maybe a little past seven between seven and eight. So we'll say somewhere like 7.5. Roughly that's for enzyme X, then enzyme Y which is a red curve. If we look for the peak of that curve, the highest point looks like right around ph seven. And then enzyme Z which is a yellow line and we look at the highest point that's looks like it's right about on the line for PHF eight. So let's look at our answer choices. It says, select the best answer. So it might not be exactly at the highest point but the one that's closest. So let's look at choice. A so it says enzyme XPH 7.5. Well, that's what we labeled as optimum rate, enzyme YPH 7.5. So we thought that was around seven. So we won't put a check mark there and then enzyme ZPH 8.0 which we thought was correct. So X and Z right on the dot But enzyme Y not. So let's look at our other answer choices and see if there's a closer one. Choice. B says enzyme XPH 7.5 put a little check mark there. Enzyme YPH 7.0 which is definitely closer. And then enzyme ZPH 8.5 not as close. So let's move on and look at another choice. Choice. C says enzyme six ph 6.5. It's a little low enzyme YPH 7.5. So a little high maybe enzyme ZPH 8.0 so that one's sort of right on the dot Let's look at choice D and I'm X ph 7.0 maybe a little low enzyme YPH, 7.0 which we thought was correct. Enzyme ZPH, 8.5. So that one not as close. So we don't definitely have a clear cut answer here. Let's look a little more closely. Let's go ahead and rule out choices C and D because each of them only have one answer that looks like it's right on the nose. Whereas A and B look like they have two. So A says uh the one that wasn't, we weren't quite sure about was enzyme Y labeled as page 7.5. Whereas to us, it looked like the highest point was right around ph seven. And if we look at choice B, the one that we questioned was, it says enzyme ZPH 8.5. Well, when we look at the curve, now let's look at where that would fall on the curve. So let's try and find ph 8.5. So make a line for ph nine, make a line for page 8.5. We could see that's still pretty high on the curve four. Enzyme Z the yellow one. And let's look at our other point and choice A and Ziy was one that was a little off, it says peach 7.5. So that's our red curve. Let's look a little more closely to find ph 7.5 and see where that is. Well, I think if we compare on choice A, that curve is fairly flat on the top and it looks like it's maybe even higher. So 7.5 might even be a better choice for NMY. So you can see when we look a little more closely, we maybe re evaluate our label a little bit. So I would say choice A is definitely the best answer here when we look at it because between seven and 7.5 that curve is fairly flat there. Whereas in enzyme Z, between eight and 8.5 the curve has already started to go down a bit. So we need to identify the best answer showing which conditions gave us closest to the optimum reaction rate. And that will be choice a enzyme XPH 7.5 enzyme YPH 7.5 and enzyme ZPH 8.0. See you in the next video.

Refer to the graph in problem 16.45 to determine if the reaction rate in each condition will be at the optimum rate or not.
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a. trypsin, pH 5.0

Verified video answer for a similar problem:

Key Concepts

Enzyme Activity

pH and Enzyme Function

Reaction Rate