WJAC AS Biology - Cell Organisitaion

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Cell Organisation

 (http://leavingbio.net/Cell%20Structure_files/Cell%20Structure_files/image023.jpg)

There are two types of cell: prokaryotic cells and eukaryotic cells. Prokaryote cells have a simple structure and were probably the first forms of life on earth. Eukaryotic cells probably evolved from prokaryotic cells around 1000 million years ago. 

Prokaryotic and Eukaryotic cells

 (http://www.nslc.wustl.edu/courses/Bio2960Su/labs/04Organelle/allcell.jpg)

An example of a prokaryotic cell is a bacterium. Eukaryotic cells are typical of the great majority organisms including animals and plants.

Prokaryotic Cells

 (http://upload.wikimedia.org/wikipedia/commons/thumb/5/5a/Average_prokaryote_cell-_en.svg/300px-Average_prokaryote_cell-_en.svg.png)

Bacteria and blue-green algae.

No membrane bound organelle.

DNA lies free in the cytoplasm.

No nuclear membrane or ER.

70s Ribosomes.

Cell wall containing murein, made of peptidoglycan

Eukaryotic Cells

 (http://marbsperiod3cellwiki.wikispaces.com/file/view/cell.png/219857372/cell.png)

Found in plants, animals, fungi and protoctists.

Membrane bound organelles.

DNA located on chromosomes.

Distinct membrane-bound organelles.

Cell wall in plants made of cellulose.

Viruses

 (http://www.ucmp.berkeley.edu/alllife/virus.gif)

Viruses cause a variety of infectious diseases in humans, animals and

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