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http://en.wikipedia.org/wiki/Prokaryote this would help you.
1.They are single celled organisms and are much smaller compared to eukaryotic cells. 2.They are unicellular and their size ranges from 1 µm and 10 µm but in a few cases they may vary in their size from 0.2 µm to 750 µm. 3.Prokaryotic organisms exist in different shapes, which includes spherical, rod, flat, coccus, bacillus, spirochete and some of them are shapeless as they do not possess constant shape. 4.They consist of very few internal structures like cell wall, ribosome, plasma membrane, cytoplasm along with circular strands of DNA. Reference http://goo.gl/IUBZmU
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