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1.2.d Outline key structural features of typical prokaryotic cells as seen in a typical bacterium (including: unicellular, 1-5μm diameter, peptidoglycan cell walls, lack of organelles surrounded by double membranes, naked circular DNA, 70S ribosomes).
![broken image](http://custom-images.strikinglycdn.com/res/hrscywv4p/image/upload/c_limit,fl_lossy,h_9000,w_1200,f_auto,q_60/2451083/858792_809712.gif)
- The two main types of cells are prokaryotic cells, e.g. bacterial cells, and eukaryotic cells, e.g. animal and plant cells.
- Prokaryotic cells are nucleus-free! (This means, that the DNA present in these cells is naked/free-floating in the cytoplasm).
Here we will describe the structure of bacteria, which is an example of a prokaryotic cell.
![Structure of an example of Prokaryote (Bacteria) Structure of an example of Prokaryote (Bacteria)](http://custom-images.strikinglycdn.com/res/hrscywv4p/image/upload/c_limit,fl_lossy,h_9000,w_1200,f_auto,q_auto/2451083/124954_342898.png)
⚠️Important points to remember that will help in your GCE CIE Biology exam:
- Bacteria DNA lies freely in the cytoplasm (i.e., naked DNA/nucleus absent).
- They have a cell wall, made of peptidoglycan, not cellulose (like eukaryotic cells)
- Ribosomes size is small (i.e., 70S ribosomes)
Done done done! See you next time! 🤛
![broken image](http://custom-images.strikinglycdn.com/res/hrscywv4p/image/upload/c_limit,fl_lossy,h_9000,w_1200,f_auto,q_60/2451083/600169_19982.gif)
References:
Jones, M., & Parkin, M. (2018). Cambridge International As and A level biology. Cambridge: Cambridge University Press.