7. Prokaryotic Cell Structures & Functions
Fimbriae & Hami
1
concept
Fimbriae & Hami
1m
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in this video, we're going to begin our lesson on february and hammy. And so for embryo are actually filaments of a pill in protein that are actually shorter than pillai themselves and they extend from the cells surface of many bacteria. Now the functions of these february are to adhere cells to one another or to adhere the cell to another surface. And so they are really involved in the formation of biofilms, those communities of microbes that live together within a extra cellular pal americ substance. And so if we take a look at this image down below, what you can see is that february adhere to each other connecting cells in a biofilm. And so notice that we're showing you a biofilm over here, This community of microbes encased in this extra cellular pol american substance or this E. P. S. Structure that you see here. And so all of these microbes that you see here are living within this biofilm. And so zooming into these bacterial cells right here notice that the bacterial cells have these little structures that are projecting off of its surface. And so those little tiny structures that are projecting off of the cell surface are the fem barrier. And once again these february uh they function in helping these cells to adhere to each other. So you can see that they are going to interact with each other to adhere to each other. But also it allows the cells to adhere to other surfaces as well. So um they are going to be very important in the formation of biofilms. And so this year concludes our introduction to february. And later in our next video will introduce hammy. So I'll see you all there.
2
Problem
ProblemThe presence of fimbriae on a bacterial cell is most likely to have a critical role in
A
Conjugation
B
Chemotaxis
C
Biofilm formation
D
DNA replication
3
concept
Hami
1m
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in this video we're going to introduce hammy. And so hammy are short filament is proteins that are only found on the surface of our kale cells. And so these hammy are specific to arcadia and are not really found on bacteria or you Kariya and the hammy. They serve as hook like appendages that act like grapples to allow them to attach to each other and to allow them to attach to other bacterial cells. And so our kale cells that have hammy, they can be found within biofilm communities and biofilm communities that have bacterial cells since they can attach to bacterial cells. And so in this example down below we're showing you how our kale cells can produce long filament is cell surface proteins called hammy. And how those hammy can be found on our cable within biofilms. And so once again over here, on the right hand side, we're showing you a biofilm and zooming into a region of the biofilm. Notice that there are arcadia here and these are kept on their cell surface. They have these structures that are projecting off and these structures are representing the hammy and the hammy once again are going to be these short filaments proteins that extend only off of the surface of our kale cells and they act like hook like appendages similar to grapples that allow them to hang on to each other and attached to each other and other bacterial cells as well. And so they're important in the formation of biofilms. And so this year concludes our brief lesson on hammy 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.
4
Problem
ProblemWhich of the following structure is found only in archaea?
A
Peptidoglycan
B
Hami
C
Fimbriae
D
Pili