The Structure of Biological Membranes 1. For a molecule to...

The Structure of Biological Membranes 1. For a molecule to function as part of a cell membrane, what are the two structural requirements? 2. Describe the lipid bilayer structure of the biological membranes. Include a sketch of the lipid bilayer, labeling the hydrophobic and hydrophilic portions of the membrane. 3. Write a few sentences describing how molecules and ions move across the cell membrane. You may need to refer to your text or notes. Include information on how the cell membrane exists as described by the fluid mosaic model. Student's Name (in ink): G. Instructor's Initials:

Transcript

00:01 So in this question, we are talking about the cell membrane and its overall structure and some of its functionality.

00:07 So i have laid out down below just a very simple sketch of the cell membrane.

00:12 Much better than probably what i could sketch.

00:14 That kind of covers all of our most important parts and components of the cell membrane.

00:20 So kind of just breaking this down and going through it.

00:23 Obviously, we know that our cell membrane is composed of phospholipids, which we know in depictions.

00:30 By something kind of like this.

00:33 Obviously you have your phosphol, phosphate kind of head right here.

00:39 And then you have your lipid tails right here.

00:43 And this is known as a glyceride type of molecule.

00:47 And when we're talking about the cell membrane and what components it needs to classify itself as a membrane, we have two major macromolecules that make this up.

00:58 And this is obviously first lipids.

01:00 Because this is what forms the basis of our bilayer.

01:05 And the other molecule is proteins.

01:09 And proteins play a major role in the movement of molecules across our membrane.

01:15 And we know that our membrane is semi -permeable, so only certain materials can move in and out.

01:21 And certain materials need more help than others.

01:24 Certain materials obviously can diffuse kind of right through our membrane with no help whatsoever.

01:29 Wall.

01:31 And other materials are either too large, they're not the right charge, or they are hydrophilic, so they cannot pass through the membrane.

01:41 And when we're talking about hydrophilic and hydrophobic, pretty much it just means water -loving or water -hating.

01:48 Hydrophilic molecules are very polar, and they love being in water compared to hydrophobic molecules, which do not like water.

01:56 They do not mix, and they don't like to be in that kind of environment.

02:00 So if you're looking for certain proteins or molecules that possess this character trait, obviously on your inside here, this is where you're going to find your hydrophobic molecules due to the fact that the inside of our membrane is where our lipids are found and lipids are non -polar, and we know that they do not get along with water...

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