Example tells us that listed below are the enzymes found in pancreatic juice and some different food items. We want to write the letter on the line next to each food to indicate which enzymes you would expect to be active in digesting it. Note some foods may require multiple enzymes and not all foods will be digested by the pancreatic juice. Alright. So we have 4 enzymes or classes of enzymes here. We have amylase, lipases, nucleases, and proteases. Let's quickly remember what each one of these digests. So do you remember what amylase digests? That's going to be starch, lipases. Lipases digest lipids or fats, nucleases digest nucleic acids, DNA or RNA, and proteases. Now that's going to digest protein. Right? Alright. So let's go through these foods and think what things are going to be in these foods. Alright. Let's start with a good old steak. Alright. When you think of steak, what's the main nutrient there that you probably think of? I think of protein. So I'm definitely going to put a protease on the line here. Protease is definitely active in breaking down that steak. What else? Well, any good steak has some marbling in it. That fat mixed in. So for that, you are going to need lipases. So I'm going to put a b on the line here. Anything else? Well, that steak is muscle cell, and so in those cells, there's definitely DNA and RNA. So you're going to need these nucleases. So I'm going to put a c on the line as well. Anything else? Well, in those cells, there probably is some starch, and you can break it down using that amylase. But I'm going to leave that off because, really, the majority of what you're going to have here are these other macronutrients. So I'm going to say d, b, and c, and be done with the steak for now. Alright. What about ice cream? Well, what's the major macronutrient that you think of when you think of ice cream? Well, there are kind of 2 that I think of. The first one though, I think of fat. And so for fat, what enzyme am I going to need? Lipases. So lipases will digest that fat in that ice cream. What else? Well, then I think of sugar. Right? Nice and sweet. Do we have enzymes here, though, that digest sugar? We don't. Right? Amylase digests starch and breaks it down into sugars, but it's actually going to be enzymes in the brush border in the lining of the small intestine that actually break down those sugars into the into the smallest molecules that can be absorbed. So we're not going to use any amylase for ice cream. Well, anything else? Well, there is a little bit of protein in the ice cream. Now it's alright, I think, if you leave that off though. So I'm just going to put this in parentheses. I'll put proteases because there is protein in ice cream. Alright. Now what about an apple? All right. Well, when I think of an apple, the first thing I think of is that sweetness. And that sweetness, again, is going to be sugar, and we are not going to have enzymes here to digest sugar. There are going to be other enzymes that we need, though, specifically apple. That's going to definitely have some starch in it. So we're going to use, I'm going to put down this a for amylase for the starch in the apple. Apples get sweeter as the starch gets broken down into sugars, but there's still going to be starch in an apple. Well, anything else? Well, in apple, there are whole cells, and so if there's whole cells, there's going to be DNA and RNA. So I'm going to put a C here as well. Alright. What about lipases and proteases? Alright. Well, again these are whole cells. So yes. Absolutely. Technically, there are going to be some fats, like in the cell membrane. There are going to be proteases, that be I'm sorry. There are going to be some proteins in there because they are cells that make up the apple, but when we're thinking about this for the main things that in there, I'm going to leave those off because there isn't going to be a lot relative to the other things here. Alright. What about rock candy? Or, and that rock candy is going to be made of sucrose. Well, sucrose has purified sugar, and we don't have any enzymes here to digest sugar. And there isn't anything else really in it for these macronucleases be I'm sorry. Macromolecules because it's a purified sugar. So I don't think it really can be digested by these pancreatic enzymes in this pancreatic juice. Alright. Well, that brings us to French fries. Good old French fries. What do you think for that one? Well, when I think of French fries, I think of potatoes, and those are definitely starchy. So you're definitely going to use amylase to break down that starch. I also think of fat. Right? A good french fries fried in some oil. So I'm going to need lipases to break down that fat. Anything else? Again, whole cells in a potato. There's going to be some DNA and RNA there. So I'm going to put c for nucleases. Now again, technically, if there's whole cells, there's going to be some proteins in there, but compared to everything else, it's going to be less. So I'm going to leave it off for now. Alright. With that, I've answered the question. We got more practice after this. Give it a try.