Genes in the nucleus are composed of deoxyribonucleic acid, in the form of a double helix.
DNA = Deoxyribonucleic Acid
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DNA is the genetic material. It is in chromosomes in nucleus.
Bacteria belong to a group called prokaryotes which have no membrane bound genetic material (a nucleus).
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For an eukaryotic cell (e.g. human cell), it is found in the nucleus. Genetic material is not bound by membrane in prokaryotic cells (e.g. bateria) but is found in a region called the nucleoid. For an eukaryotic cell, some genetic material can also be found inside the mitochondria and chloroplasts.
A cells nucleus, mitochondria or a chloroplast may contain the DNA.