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the cell's genetic material, contained in chromosomes within the cell nucleus and mitochondria. ... A chromosome contains many genes. A gene is a segment of DNA that provides the code to construct a protein. The DNA molecule is a long, coiled double helix that resembles a spiral staircase.
Chromosomes are primarily composed of DNA... Basically DNA wraps itself around chromosomal proteins into structures called chromosomes. Genes are units of DNA that have a specific function.
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