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In this topic of IBDP Biology, we will learn about prokaryotic cells.
The ultrastructure of Escherichia coli (E. coli) as an example of a prokaryote
- Note the absence of membrane bound organelles
- If you look at the IBDP Biology curriculum, There is no true nucleus with a nuclear membrane
- The ribosome's are smaller than eukaryotic cells
- The slime capsule is used as a means of attachment to a surface
- Only flagellate bacteria have the flagellum
- Plasmids are very small circular pieces of DNA that maybe transferred from one bacteria to another.
Identify structures in electron micrograph of Escherichia Coli
State that prokaryotes divide by binary fission.
- Referring to the IBDP Biology specification, Prokaryotes divide by binary fission.
- The process starts with DNA replication, then separation of the two circular strands to either side of the cell. Then cytokenesis occurs: division into two.
- Each new cell has about half of the cytoplasm.
- Growth restores the original size.
That's the end of this topic.
