What’s the difference between DNA, a genome, and a chromosome?
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DNA is a chemical. It’s got a structure that allows any molecule to be of arbitrary length, and to encode information by varying the exact composition along the strand.
A genome is the full set of genes of an organism. These genes are encoded in the DNA.
A chromosome is a physical structure found in cells, consisting of DNA coiled up on itself. In most organisms these come in pairs, and each pair contains the same genes (but with variations between them).
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