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Cells contain DNA—the hereditary material of all living systems.
The genome is an organism’s complete set of DNA and is organized into chromosomes.
DNA contains genes whose sequence specifies how and when to build proteins.
Proteins perform most essential life functions, often working together as molecular machines.
Molecular machines interact through complex, interconnected pathways and networks to make the cell come alive.
Communities of cells range from associations of microbes (each a single cell) to the hundred trillion cells in a human being.