The Glycocalyx: Capsules & Slime Layers - Video Tutorials & Practice Problems
On a tight schedule?
Get a 10 bullets summary of the topic
1
concept
The Glycocalyx: Capsules & Slime Layers
Video duration:
2m
Play a video:
in this video, we're going to begin our lesson on the Glick Okay Alex along with capsules and slime layers And so most bacteria are surrounded by a layer of a sticky gel like substance called the glencoe Calix. And so this Glick okay, Alex is a complex poly sakurai and it is going to create a layer that is surrounding the outside of the cell. And so this Glick Okay Alex layer is being represented in the image down below as a yellow border surrounding the cells and they can be surrounding either gram negative cells or grand positive cells. And once again this is the glencoe Calix. And so this click OK, Alex is going to promote adhesion of cells to solid surfaces and to other cells as well, allowing cells to stick onto surfaces and allowing cells to stick to each other. And it's also going to play an important protective role. It is going to protect the cell from dehydration by helping to retain water and it can also collect nutrients from the environment for energy purposes since it's so sticky it can stick and collect nutrients. And so if we take a look at this image down below, once again, the Gleick okay Alex is the yellow border that is surrounding the sell the perimeter of the cell and if you zoom in here, what we have is the Gleick, okay Alex shown as a complex policy sacred structure that is going to be surrounding the perimeter of the self and our images. We represent them like okay Alex with a yellow background. Like you see here now there are actually different categories of the Gleick, Okay Alex based on the composition of its structure and so we'll be able to talk more about this, the different categories of black okay Alex like capsules and slime layers and our next video. So I'll see you guys there.
2
Problem
Problem
What is the function of the glycocalyx in bacterial cells?
A
Attachment of cells to surfaces and other cells
B
Protein synthesis
C
Phagocytosis of other cells
D
DNA replication
3
Problem
Problem
__________ is the slime-like layer of polysaccharides on the outer surface of bacterial cells.
A
The outer membrane
B
The cytoplasm
C
The glycocalyx
D
The periplasm
E
The S-layer
4
concept
Capsules vs. Slime Layers
Video duration:
1m
Play a video:
In this video, we're going to briefly distinguish between capsules and slime layers which are really two categories of the Glick Okay Alex, two forms that the Glick Okay Alex can take on And so capsules are highly organized and dense layers of policy Sacco rides that are tightly anchored to the cell. Now, slime layers, on the other hand, are unorganized layers of poly sacha rides and they are going to be easily removable from the south because they are not as tightly angered. And so if we take a look at the image down below, notice that the top half of the image is focused in on capsules and the bottom half of the images focused in on slime layers and notice that both of them are represented as a yellow border that is surrounding the perimeter of the south. However, noticed that the capsule is very highly organized, whereas the slime layer is not nearly as organized and um it's going to be easily removable from the cell, whereas the capsules on top are going to be tightly anchored and so zooming in. You can see the organized structure of the capsule, uh and the unorganized structure of the slime layer. Now, regardless if the glencoe Calix takes on a capsule or slime layer form the Glick. Okay, Alex is going to be important for the formation of what are known as biofilms. And so we'll get to talk a lot more about biofilms in our next lesson video. But for now this year concludes our brief lesson here on capsules versus slime layers and we'll be able to get some practice applying these concepts as we move forward. So I'll see you all in our next video.
5
Problem
Problem
___________ are an organized layer of polysaccharides tightly anchored to the cell wall.
A
Capsules
B
Periplasms
C
Slime-layers
D
Teichoic acids
E
Lipopolysaccharides
6
Problem
Problem
Which of the following is not a function of slime layers and capsules:
A
Protection against dehydration.
B
Collect nutrients from its surroundings.
C
Attachment to other cells & solid surfaces.
D
Anchors the outer membrane to peptidoglycan.
Additional resources for The Glycocalyx: Capsules & Slime Layers
