The electron transport chain .
a. is located in...

Question

The electron transport chain                   .
a. is located in the matrix of the mitochondrion;
b. has the electronegative carbon dioxide at its base;
c. is a series of nucleotides located in the inner mitochondrial membrane;
d. is a series of enzymes located in the intermembrane space;
e. moves electrons from protein to protein and moves protons from the matrix into the intermembrane space

Accepted Answer

welcome back Our next question says, what is the direction of movement of hydrogen ions in the electron transport chain by using energy from electrons. So let's recall from our content videos that electrons move through the electron transport chain and releasing energy as they move and this energy is used to move hydrogen ions against a concentration gradient. So our question is saying, what is the direction of the movement of those hydrogen ions? Well, the electron transport chain can be a little complicated, a little difficult to understand. I'm just gonna put up a really quick and dirty um diagram right here. A little drawing but there is a fantastic content video um with the depiction of the electron transport chain as an airport on the website. I really recommend you check it out if you haven't. A great way of helping to remember these um aspects of the electron transport chain. It imagines the electron carriers as little taxis coming up and dropping off their electron passengers and those passengers bringing hydrogen ion luggage that gets lost at the airport. So, great way of remembering this really encourage you to check out that content video. But here's my little basic diagram to remind us. So we have our electron transport chain, these proteins embedded in the inner mitochondrial membrane. So there's our inner membrane and the hydrogen ions are starting out here in the mitochondrial matrix. That's where they start an area of lower concentration. The energy released as electrons move through the chain is used to pump them through the inner mitochondrial membrane into this inter membrane space. It's called that because in between the inner mitochondrial membrane and the outer mitochondrial membrane. So when we look at our answer choices, we see that their choices for where the hydrogen ions are being moved. Our matrix, inter membrane space and inner mitochondrial membrane. So we have identified all those things on our diagram. Let's think through the correct answer. So we know that they start in the matrix. So let's eliminate any answer choice. That doesn't start with the matrix. So B. And C. Cannot be our correct answer. Only A. And D. Start in the matrix. So, let's look at choice A. Says from matrix to inter membrane space. And this is correct. We see here the hydrogen ions into the more concentrated area in the inter membrane space. So choice A. Is the correct answer. And let's just see why Choice D. Is incorrect. Choice D says from the matrix to the inner mitochondrial membrane while the hydrogen ions pass through that membrane. But they aren't going to it. So they go across that membrane but end up in the inter membrane space. So that's why Choice D. Is incorrect. So, again, our correct answer for the direction of movement to the hydrogen ions in the electron transport chain. Using energy from electrons is choice A. From the matrix to the inter membrane space. Hope that helped. We'll see you in the next video

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