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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
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- 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
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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.
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