Similarities and Differences Between Prokaryotic and Eukaryotic Cells Similarities Both types have DNA, cytoplasm, cell membranes, and ribosomes. They also have all seven living characteristics in common (grow and develop, DNA, respond to stimuli, reproduce, excrete, use energy, and they are cells of course) Differences Prokaryotic No membrane-covered organelles No Nucleus Circular DNA Much smaller than eukaryotic cells Theory is that they are much older than eukaryotic cells Has three general shapes- spheres, spirals, or rod shaped Eukaryotic Bunches of membranecovered organelles Has a nucleus Linear DNA Larger than prokaryotic Theory is that they evolved from prokaryotic cells Animal- usually round shaped Plant- usually rectangular shaped