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QUESTION 2727. Identify the barriers in the right order (outside to inside): Oa Cell membrane; cell wall; nuclear membrane Ob. Nuclear membrane; cell membrane, cell...

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QUESTION 2727. Identify the barriers in the right order (outside to inside): Oa Cell membrane; cell wall; nuclear membrane Ob. Nuclear membrane; cell membrane, cell wall O c Cell wall, cell membrane, nuclear membrane d. Cell membrane is the only barrier to be broken to release the DNAQUESTION 28CHAPTER QUESTIONS 28-50, Question 28. Which of the following compound(s) qualifies to be an organic compound? CH4 C4HSO CAH1O d. All the above (a, b, c) are organic compounds None of the above (a, b €)

QUESTION 27 27. Identify the barriers in the right order (outside to inside): Oa Cell membrane; cell wall; nuclear membrane Ob. Nuclear membrane; cell membrane, cell wall O c Cell wall, cell membrane, nuclear membrane d. Cell membrane is the only barrier to be broken to release the DNA QUESTION 28 CHAPTER QUESTIONS 28-50, Question 28. Which of the following compound(s) qualifies to be an organic compound? CH4 C4HSO CAH1O d. All the above (a, b, c) are organic compounds None of the above (a, b €) are organic compounds



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Identify the $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ shown in this figure? (a) A-Cell wall, B-DNA, C-Cell membrane (b) A-DNA, B-Cell membrane, C-Cell wall (c) A-Cell membrane, B-DNA, C-Cell wall (d) A-DNA, B-Cell wall, C-Cell membrane

All right now this question has to do with the selective permeability. Mhm. Mhm. Of the cell membrane. Okay as you can see here, I have a little sketch of my cell membranes showing you the salient points. Okay. The cell membrane structure is basically mainly fossil lipid bi layer with proteins and some like a lipid some cholesterol too. But I left that out because it doesn't pertain to this particular um topic. Okay now what is selective permeability essentially? How does it control what can go in or out of the cell? That's what selective permeability is about. So bearing that in mind you can kind of see that anything that's going to help something transport is going to affect the selective permeability. Um So a couple of things here we can knock off right away. For example the glycol lipid, a guy like a lipid here is going to um function as a recognition tag. Uh It's a carbohydrate I. D. Tag. But it's not gonna help really with transport and helping things in and out. So again like a lipid uh is not gonna help that. Now proteins proteins do help transport things in and out. Okay but there's different kinds of proteins. Not all proteins are considered the same. Now this protein here on the edge is going to be a peripheral peripheral. Remember the word peripheral means to the side, a peripheral protein. Let's get rid of that part right there. It's not so clear. So let's go with peripheral now peripheral protein to the side. Um Could have many important jobs. But one thing it's not gonna be able to do is get things like in this case on the inside it's not going to get things out. It just doesn't go all that far. It just stays on the insert on the inner part so that's not going to do anything. And if it were on the outer part of the cell, same thing. So peripheral proteins do not help transport in and out. So it will not help selective permeability. Well the next part is the other protein. Okay. A protein as you can see here that goes all the way through. Could work as a channel protein and active transport protein. It can help things go in and out through cell. So definitely this guy is going to help with um selective permeability. Now the other one, the fossil lipid bi layer. Well you're like that's just the structural thing. Well no if you think about it, what's that fossil lipid bi layer made of phosphor all lipids? So because of the way that by layer is made phosphor lipids, it also will control what can go in or out. Because if you are hydra filic or polar, you're going to have a lot of trouble getting past that fatty acid tail double layer in the middle of the fossil lipid bi layer. Okay, you're not going to be allowed to go through the fossil um lipid violator. That whole middle section is very very non polar. So charged ions don't tend to go through without help, you know? Um So things that are hydra filic uh I miss built their hydra filic and polar will tend not to go through. However, if you are hydrophobic or non polar, you will tend to go through a lot easier because you will be able to diffuse through that lipid bi layer. So both the fossil lipid bi layer and the proteins that are trans membrane transport proteins will help you in your selective probability.

Okay now here we're addressing the structure of the cell membrane. As you can see by this drawing here. This is the basis of the main basis actually should I say, of the cell membrane. This here is the phosphate. So lipid bi layer. Okay, so these are two layers of foss follow lipids and you can see what he says by layer. That means to Okay, so one layer of fossil lipid is faced one way and the other is faced another way. Why? Because remember these little phosphate heads or what we call hydro filic means they like water. Meanwhile these fatty acid tales our hydro phobic. So when you're talking about the cell membrane um this is like the background of the whole thing and everything else is stuck onto this fossil lipid bi layer. Now the cell membrane is a very important part of the cell because it controls what goes in and out of the cell. And it does that in a variety of ways. One of the main ways is it involves proteins. So let me put a protein just embedded in here. Not the best artist in the world. But you can see that that protein goes all the way through. So maybe that protein can help transport things do other bunches of things. Sometimes a protein could just be on one side or the other. So there's another kind of protein. So we got proteins all over the fossil lipid bi layer as well. But the fossil lipid bi layer is like the main part in addition to proteins. Okay, we have some other things in our fossil lipid bi layer as well. Um we have some times um cholesterol and some carbohydrate. Now let me just name that carbohydrate. Now the carbohydrate towards the outside. And let me just put in some cholesterol as well. Okay, as you can see it's starting to look almost a little bit like a mess but there's a purpose to all this stuff. Everything has a different job and that's why everything is present in a different amount. The cholesterol helps with the fluidity of the membrane. The carbohydrate. It's big job is helping with recognition function is I. D. Tags. Um But as you can see the main structure still is that false full lipid bi layer uh with the protein scattered throughout. Which is why a lot of times um Since it is this big bi layer with things just seemingly scattered throughout it, we call it the fluid mosaic model because you have a fluid fossil lipid bi layer with all these other structures stuck to it.

Today and talk about bacteria versus archaea bacteria. Bacteria is also referred to as you bacteria, their true bacteria. It's the bacteria that is in and among and around us. I kind of average joe bacteria, archaea bacteria or archaea, as that is referred to often are the ancient bacteria. And this is the kind of bacteria honestly, that populated the vast majority of the planet prior to us having oxygen atmosphere early in kind of earth development. Um, they're currently more like being alive on the bottom of the ocean floor and the hot springs of car where, like the gusher of the use at a meeting where it spouts up and has a geiser, uh, flow of hot water that these things actually live in those areas Salt Lakes of Salt Lake City, Utah, for example. So bacteria and archaea very similar, and that they both have very little membrane structure. So there is this question about this question of differences between bacteria and archaea. So one of the first things that we could do is eliminate that of the internal membrane structure. As a non answer, we can eliminate that question, complete that twice completely out and What we're left with then is two other descriptions and then one other that says Okay, so could it be both of these? Talk to descriptions. And so what I'm gonna do is I'm gonna tear this apart and see if I can't discover if it's only one or the other or if, in fact, it is Aziz The last twice tells us possibly that it's both, uh, depending on how our final answer returns out. And so, as we're looking at this diagram, stupid, perhaps structure of looking at the captain of like can And this is a carbohydrate. It's a structural carbohydrate, and it sits in a cell wall and this is one that has glide can and it you can see the picture in the glide can And then we have with bacteria that we can have something called gram positive. Yeah, G bacteria wall. What we can have something is called gram negative gram negative bacteria wall. And either the two cases, What we're seeing is that the peptide of like it is in fact, in on eso Well, one is a little bit thicker. One has got a little bit, uh, different arrangement and maybe not as thick and in either of the situations. What we're looking at is which this is an overall kind of generalized depiction of regular bacteria or just bacteria, and that the Pentagon Glikin is present. Arkia, on the other hand, does not have Pepe don't like him. So choice A so far is correct. We're going to continue to look at choice B to see if that in fact is also correct and then last to see Okay, so we choose one of the other. Or should it be that we choose the very last choice, which is that both are correct And then secondly, even though that their rival cells are the same size between bacteria on our kid, right, they are actually made out of different sets of proteins. And in fact, archaea more closely resembles Eukaryotic Roberts homes, even though like their squalor, they have the same kinds and types of proteins is what do eukaryotic cell Robson would look like. So the choices simple that this is as an answer set, but it could be either a or B

Let us complete the following sentence. The chemical composition of biological membranes is blank. Let us again look over the sentence. The chemical composition of biological membranes is biological membranes are by layers of fossil lipids with associated proteins and carbohydrates.


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