Are viruses living cells?

Are viruses living cells?

• A. Yes
• B. Sometimes
• C. Always
• D. No

Answer: (D)

The idea being tested is how we define life and what counts as a cell. Viruses can reproduce and evolve, but they don’t carry out metabolic processes or maintain cellular structure on their own. They’re acellular particles made of a genome enclosed in a protein coat, and sometimes wrapped in a lipid envelope. They lack a plasma membrane, cytoplasm, and organelles, and they can’t generate energy or synthesize proteins by themselves. Their replication hinges on hijacking a host cell’s machinery, enzymes, and energy sources. Because of this dependence on another cell and the absence of independent metabolism and cellular organization, viruses are not living cells.

The idea being tested is how we define life and what counts as a cell. Viruses can reproduce and evolve, but they don’t carry out metabolic processes or maintain cellular structure on their own. They’re acellular particles made of a genome enclosed in a protein coat, and sometimes wrapped in a lipid envelope. They lack a plasma membrane, cytoplasm, and organelles, and they can’t generate energy or synthesize proteins by themselves. Their replication hinges on hijacking a host cell’s machinery, enzymes, and energy sources. Because of this dependence on another cell and the absence of independent metabolism and cellular organization, viruses are not living cells.