Structure of cells

Prokaryotes 

Prokaryotes are simple cells such as bacteria and archaebateria. 

Arcaebacteria are ancient bacteria with different types of cell wall and genetic code to other bacteria. 

Prokaryotic cells:

• smaller than eukrayotic cells,
• Have a cytoplasm, a cell membrane and a cell wall, 
• have genetic matherial in the form of a Dna loop together with rings of DNA (Plamid DNA),
• They have no nucleus.

The plasmid DNA- a small, commonly circular, section of the DNA that can replicate independently of chromosomal DNA.

Ribosomes- Sites of protein manufacture.

Chromososomal DNA- The DNA of the bacteria is not found within a nucleus and is usually found in one circular chromosome.

Flagella- Tail-like structures that rotate to help bacteria move.

Cell wall- Provides structual support to the bacteria (not made of cellulose).

Cytoplasm.

relative size:

A prkaryotic cell is between 1-10 micrometres.

A eukrayotic cell is between 10-100 micrometres.

Eukrayotic cell

Eukaryotic cells:

• Are more complex than prokaryotic…