Hi! I'm sorry I've been away. Let's get started.

Okay. Let's look at the first question. What's the optimum pH for each enzyme? Take a look at the graph. Do you see how there are two lines that form hills, on that graph? Each hill is an enzyme. The solid hill is enzyme A, and the dotted hill is enzyme B. Now, look at the top of each hill. The top of each hill is the point where the enzymes work at their best. Question #1 calls it the "optimum," you see there. Look at the top of each hill. What are the pH numbers, for each of the highest points, on each hill? (You can see the pH number line, across the bottom of the graph.)

Enzyme A: 3 Enzyme B: 7

Yes! Close enough. Enzyme A looks to be about 3. Enzyme B actually looks like it's a liiiiittle higher than 7. Let's say 7.5, kay? So, let's look at the question again: What is the optimum pH for Enzyme A and Enzyme B? We have our answer now. The optimum pH for Enzyme A is 3 and the optimum pH for Enzyme B is 7.5. The "optimum pH" is the pH level where the enzymes work their best.

Okay, we're onto question #2. Take a look at the graph, with me. Across the bottom of the graph, we have the pH number line. Yes? And on the left side of the graph, we have the "rate of enzyme action," you see? Now, take a look at the graph, and find the place where the pH is 5. What do you notice about the rates, of each enzyme, when the pH is 5?

So for number 2 would it be Enzyme B works faster than Enzyme A when the pH is 5?

You think enzyme B works faster, at a 5 pH? Here, let me ask you this question.... What is the pH number where the two lines touch one another?

The two lines only touch one another, at one place, on the entire graph. What's the pH number, at that place?

Is it 5? On my paper it looks like 4.98.. I can't tell.

lol you're very precise! I like that. Yeah, it is 4.9822323 blah blah BUT we can round it up to 5. So we'll say 5.

Okay, so since the two lines touch one another at pH 5, then that means that when the pH is 5, they have the same exact rate of reaction. Do you get it?

Okay, lol :P and yes ^

And there's our answer for #2!

Now, we're on to question #3. The instructions told us that Enzyme A is in the stomach, and Enzyme B is in the intestines. Question #3 is asking us... What can you tell, about the pH of the stomach? Let's look at enzyme A, which is found in the stomach. We know that Enzyme A works its best, when the pH is 3. Right? So, would you agree that the pH level in the stomach is around 3?

Yes

Okay! That was easy. There's our answer for question #3. We can "infer" that the pH level in the stomach is around 3, because that is where Enzyme A is at its highest "rate of action."

Now, we're on to question #4. It's asking us what we can tell about the pH of the intestine. So NOW we have to look at Enzyme B. And we do the same thing we did with question #3, only this time, we're looking at Enzyme B. Do you think you have an answer?

The pH level in the intestine is around 7.5, because that is where Enzyme B is at its highest "rate of action." Right?

Yep! Perfect.

Okay, now we're on to question #5. It sounds more complicated than it is. Let me go over some facts that we already know: 1. Enzyme B is found in the intestine. 2. Enzyme B can ONLY work, when the pH is anywhere from 4 to 12. (You can take another look at the graph, and see that the dotted line only goes from 4 to 12.) 3. Enzyme B works its best, when the pH is 7.5. Do you understand all of these facts, so far?

Yes, btw, I'm sorry I replied late, my mother called me.

It's okay, I understand. Let's get back into question #5. The question is asking us to pretend that Enzyme A is in the intestines. Let me ask you two questions here: 1. What is the pH range where Enzyme A can work? (From what number, to what number?) 2. What is the "relative pH" of the intestine, that we've mentioned before?

1. Enzyme A can work from pH 0 to pH 6 2. The "relative pH" of the intestine is around 7.5.

Okay! So, if Enzyme A were in the intestine, would it work?

I'm not sure if I'm correct, but I'm saying no because the pH range where Enzyme A can work can't include the "relative pH" of the intestine which is 7.5.

Well that's right, actually. That's right on.

So we know that Enzyme A would not work, in the intestine. Because its working pH is 0 to 6. But the intestine's pH is 7.5. Too high. Now here's another fact: The digestive system needs working enzymes, in order to function. If the digestive system did not have working enzymes, then the digestive processes would stop. Does that make sense to you?

Yes

Okay. So let's look at question #5. It basically asks us... What do you think would happen to the digestive process, if Enzyme A were in the intestine? Do you think you know this one?

The digestive processes of the organism would stop. Right?

Yeah! That's right. Even better yet!....The digestive processes of the organism would not be able to work normally.

Thank you very much!! :)