Bacteria: 1,000 nm Animal: 200,000 nm Plant: 400,000 nm
Multiply only within cells; outside the cell they are metabolically inert; protein coat and nucleic acid separate prior to multiplication
Most are free-living and multiply in the absence of other cells; entire cell remains intact during multiplication
Nucleic Acid Content
Contain either DNA or RNA, but never both
Always contain both DNA and RNA
Contain very few, if any, enzymes
Contain many enzymes
Lack ribosomes and enzymes for harvesting energy
Contain ribosomes and enzymes for harvesting energy
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