In the last lesson, we discussed plant and animal cells. CSEC also requires that you understand the basic structure of a few microbes (microorganisms), that is, extremely small organisms including members of the Prokaryotae kingdom, some members of the Protoctista kingdom and some members of the fungi kingdom.
The most basic difference between prokaryotes and plants and animal cells is the lack of a true (membrane-bound) nucleus. Instead of having a nucleus, they store their DNA in a region known as the nucleoid, and also in smaller regions called plasmids.
We discuss more details about bacterial cells and how they compare to other types of cells in the following video:
An amoeba, however, is a eukaryote and has a true nucleus surrounded by a nuclear membrane and membrane bound organelles.