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Why are bacterial artificial chromosomes useful for cloning large pieces of DNA?

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DNA extraction and recombinant DNA technology — recombinant DNA The process of DNA extraction is necessary to isolate molecules of DNA from cells or tissues. A series of steps, including the use of protease enzymes to strip proteins from the DNA, are required for isolating pure DNA that is suitable for use in later procedures, such as cloning or sequencing.

Bacterial artificial chromosomes (BACs) are highly useful in recombinant DNA technology because they are engineered to carry much larger amounts of DNA than standard vectors like pUC plasmids or lambda phage.1

Based on the F-factor (fertility factor) plasmids of Escherichia coli, BACs provide a stable platform for cloning and amplifying extensive segments of genomic DNA. This capacity is essential for modern genomics, as it allows researchers to break down and manage large, complex genomes—such as the human genome—into manageable, ordered fragments for detailed analysis and sequencing. By enabling the cloning of these large inserts, BACs facilitate the creation of high-quality physical maps and genomic libraries that are foundational to understanding the structure and function of an organism's complete set of genetic material.123