Where specifically does the most significant production of ATP...

Question

Where specifically does the most significant production of ATP occur in prokaryotic and eukaryotic cells?

Accepted Answer

Hi, everybody. Welcome back. Let's look at our next question. It says which of the following eu Karic cell structures is linked to the highest amount of A TP production. A inter mitochondrial membrane b outer mitochondrial membrane, c plasma membrane or D mitochondrial matrix. So let's think about where ATP production goes on in a U Kario cell. And that's in the mitochondria. Now, just an interesting note, um we often talk about in terms of strategies for multiple choice tests that the right answer is often the one that's different from the others in this case, that would lead you astray as three of our answer choices have to do with the mitochondria. And if you chose plasma membrane, you would not be correct plasma membrane or outer membrane of the cell is where a TP production goes on in prokaryotic cells, which don't have mitochondria, but not where a TP production goes on in U Karic cells. So we know we're talking about the mitochondria. So we need to think a little bit about the structure of mitochondria to determine which of these is the correct location. So here's an extremely rough diagram of part of the little little slight section of the mitochondria. So I have two sets of double lines. Recall the mitochondria have two sets of membranes or two membranes, an outer membrane surrounding the whole mitochondria and then these folds making up an inner membrane. So I have the top set of double lines which is going to represent my outer mitochondrial membrane. So on top of that outer membrane will be the cell cytoplasm. And then the second set of double lines with the little shapes in them representing proteins in the membrane is my inner mitochondrial membrane. And that of course makes the space in between them. The inter membrane space and below my inner mitochondrial membrane is the mitochondrial matrix. Now, I drew those little structures to remind us what, how is it that A TP is produced in the mitochondria? Well, it's produced directly by the enzyme A TP synthese in that process of chemi osmosis. So that process is taking place within this inner mitochondrial membrane. The series of ovals I drew on the left side within that membrane are the proteins of the electron transport chain. I'll just write etc with a little arrow there. And then this sort of larger thing that represents a membrane protein is going to be our A P synthesis. Recall the chem osmosis, we have protons being pumped against their concentration gradient into the inter membrane space. So we've got electron carriers coming up giving electrons to the electron transport chain and the energy that's released as they move through that electron transport chain drives this um transport of protons and then protons will flow down the concentration gradient through a TP symt. And the energy released by that process is what harnesses the phosphor or is harnessed in the phosphorylation of AD P to produce a TP. This chem osmosis process is the highest amount of A TP production in all of cellular respiration. So a little bit of A TP is produced for instance by glycolysis in a cell cytoplasm. But this is the location of the highest amount through km osmosis. So that location will be choice a the inner mitochondrial membrane. Since that's where our A TP synthese is located, then choice b the outer mitochondrial membrane. Um that's not where this process is going on. Um nor the choice T mitochondrial matrix. So again, the U Karic cell structure linked to the highest amount of A TP production is all those enzymes located in choice a the inner mitochondrial membrane. See you in the next video.

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Where specifically does the most significant production of ATP occur in prokaryotic and eukaryotic cells?

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