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Viruses are essentially a DNA or RNA fragment in a capsid, with some containing an envelope. They are not living organisms and are not cells. They do not have a plasma membrane and organelles.
Prokaryotic cells have a complex cell wall, ribosomes, and no cytoskeleton. Their organelles are not membrane bounded, and they contain circular DNA. Their DNA is contained inside a space called the nucleolus. They also have flagella for moving around their environment.
Eukaryotic cells contain membrane bounded organelles, a cytoskeleton, linear DNA with histones inside the nucleus, and are 10-100 ul in diameter. Some eukaryotes have a cell wall such as plants.
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