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Free download cell structure8/8/2023 ![]() ![]() ![]() Prokaryotic cells, which are relatively smaller than eukaryotic cells, lack a nucleus or organelles and have a single circular molecule of DNA (chromosome) plus optional, smaller, circular molecules of DNA called plasmids.Įukaryotic cells have a nucleus, membrane-bound organelles, and multiple, compartmentalized molecules of linear DNA. All cells have a plasma membrane, made of lipids and proteins, to regulate substance exchange with the external environment. A cell is the microscopic functional and structural unit of all living organisms. ![]()
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