Eubacteria and Eukaryotic Cells

Eubacteria, also known as true bacteria, are prokaryotic organisms that lack a nucleus and other membrane-bound organelles. On the other hand, eukaryotic cells are more complex and have a nucleus, as well as other membrane-bound organelles.

Cellular Components of Eubacteria

Despite lacking a nucleus and other membrane-bound organelles, eubacteria do have several cellular components that resemble those found in eukaryotic cells. These include:

- Cell wall: Eubacteria have a rigid cell wall that provides support and protection to the cell. However, unlike eukaryotic cells, the cell wall of eubacteria is made up of peptidoglycan.
- Plasma membrane: The plasma membrane of eubacteria is similar in structure and function to that of eukaryotic cells. It is a selectively permeable membrane that regulates the movement of molecules in and out of the cell.
- Ribosomes: Eubacteria have ribosomes, which are responsible for protein synthesis. However, the ribosomes of eubacteria are smaller and structurally different from those found in eukaryotic cells.
- Flagella: Some eubacteria have flagella, which are whip-like structures that allow the cell to move. Flagella in eubacteria are structurally different from those found in eukaryotic cells.

Resemblance to Eukaryotic Cells

Of these cellular components, the plasma membrane of eubacteria is the one that most closely resembles that of eukaryotic cells. Both plasma membranes are made up of a phospholipid bilayer and contain proteins that regulate the movement of molecules in and out of the cell. This similarity is thought to be due to the fact that both eubacteria and eukaryotic cells evolved from a common ancestor cell that had a similar plasma membrane.

Conclusion

In summary, while eubacteria lack many of the membrane-bound organelles found in eukaryotic cells, they do have a plasma membrane that is structurally and functionally similar.

Within the cell wall of eubacteria, is the plasma membrane, which, like the eukaryotic plasma membrane, is a phospholipid bilayer studded with proteins.

The cell wall of eubacteria is made up of peptidoglycan while in some eukaryotes like fungi, the cell wall is made of chitin and in plants it is cellulosic.

In eubacteria, the nucleus is not bounded by any membrane and is called nucleoid while in eukaryotes it is bounded by a double membrane envelope. 

Eubacteria ribosomes are 70S type while eukaryotic ribosomes are 80S type