So now that we've talked about some features of prokaryotic cells in our last lesson video, in this video we're going to talk about some features of eukaryotic cells. Now, eukaryotic cells, unlike prokaryotic cells, actually contain several membrane-bound organelles that includes a nucleus. And so eukaryotic cells do have a nucleus, unlike prokaryotic cells that do not have a nucleus. Now, eukaryotic DNA is actually linear in its shape, unlike prokaryotic DNA, which is circular in its shape. Eukaryotic DNA is actually going to be found on the inside of the nucleus that it contains.
Whereas, once again, prokaryotic cells do not have a nucleus, so their DNA is not found inside of the nucleus. Instead, recall that prokaryotic cells, their DNA is found inside of the nucleoid. And so, don't confuse the nucleus with the nucleoid. Now also recall from our last lesson video that all cells have these structures called ribosomes that make proteins, and we'll get to talk more about ribosomes later in our course, but we know all cells have ribosomes. Recall from our last lesson video, prokaryotic cells have really small 70 S ribosomes, but eukaryotic cells, on the other hand or eukaryotes, have really large ribosomes that we call 80 S ribosomes, and so, they are larger.
And also, eukaryotic cells or eukaryotes, instead of dividing by binary fission like prokaryotic cells, eukaryotic cells, when they divide, they divide by a process called mitosis and cytokinesis, which we'll get to talk more about mitosis and cytokinesis later in our course. But we should know that eukaryotic cells divide by a more complicated process called mitosis and cytokinesis. And so if we take a look at our image down below at this eukaryotic cell, one thing to note is that, there are lots of membrane-bound organelles on the inside of the eukaryotic cells. There's a lot more going on inside a eukaryotic cell than a prokaryotic cell. And eukaryotic cells, we know, are much larger.
So because they're much larger, they can fit so many more organelles, membrane-bound organelles. Now notice that eukaryotic cells, they do have a nucleus which is represented by this circle that you see here. And on the inside of the nucleus, that's where you'll find the DNA of the cell. And recall, eukaryotic cells, they specifically have DNA that is linear in its shape, and so, it's linear, like what we see here. So we can label this as linear DNA.
And notice that these little blue circles that we see throughout represent ribosomes. And so, zooming into one of these little blue circles here, you can see this represents the eukaryotic ribosome, which we know is going to be quite large, and it's going to be a large 80 S ribosome. And so once again, the number here is going to imply, with the size, and the S is just an abbreviation for a fancy unit that we're not really going to talk about in this course. And so, once again, zooming into the ribosome of the eukaryotic cell, it is going to be larger. It is a larger 80 S ribosome.
And so this here concludes our introduction to some of the features of eukaryotic cells. And as we move forward in our course, we'll be able to talk more and more about these cells. So I'll see you all in our next video.