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Eukaryotic cells contain a nucleus with a nuclear membrane enclosing multiple chromosomes, while prokaryotic cells have a single chromosome. Learn the main differences and similarities between eukaryotic and prokaryotic cells, the two main types of organisms on Earth. See a comparison chart, definitions, examples, and diagrams of their structures and features. Prokaryotes Structure (Components/ Parts) The structure of a prokaryote is not as complex as eukaryotic cells as they have primitive cell organelles. Generally, most prokaryotic cells have the following components/ parts: Capsule This is an additional outer covering in some prokaryotic cells that serve to protect the cell against foreign invaders. The capsule is made up of polysaccharides, that allows the cells to cling to various surfaces and preserves the moisture in the cell. Cell wall ... Learn the basic features and characteristics of prokaryotic and eukaryotic cells, the two main types of cells in biology. Compare and contrast their structure, function, reproduction, examples and more with this comprehensive guide.