A '''DNA library''' a collection of the multiple DNA fragments that is a population of the genetically transformed micro-organisms (usually bacteria or yeast). Each such micro-organism has a fragment of the library DNA, storing and propagating it.
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A '''DNA library''' a collection of the multiple [[DNA]] fragments that is a population of the genetically transformed [[Microorganism|micro-organisms]] (usually [[bacteria]] or [[yeast]]). Each such micro-organism has a fragment of the library DNA, storing and propagating it.
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A cell would not retain and replicate a random piece of foreign DNA inside it. To make this possible, the DNA fragments are flanked by additional sequences, making cell to treat them as part of the own genome.
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A cell would not retain and replicate a random piece of foreign DNA inside it. To make this possible, the DNA fragments are flanked by additional sequences, causing the cell to treat them as part of the own [[genome]].