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Recombinant DNA technology involves the manipulation and combination of DNA from different sources to create new genetic combinations. One of the fundamental tools in this technology is the plasmid vector, which plays a critical role in cloning and gene manipulation. A plasmid vector is a small, circular, double-stranded DNA molecule found naturally in bacteria, separate from their chromosomal DNA. These plasmids are capable of autonomous replication inside bacterial cells, making them ideal carriers or vectors for foreign DNA in genetic engineering. The construction and development of a plasmid vector begin with selecting an appropriate plasmid that has certain essential features. These features include an origin of replication (ori), which allows the plasmid to replicate independently within the host cell; a selectable marker gene, typically an antibiotic resistance gene, which helps identify cells that have successfully taken up the plasmid; and multiple cloning sites _______ ______ ___ ________ _________ ______ _______ ____.
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