<P> In molecular cloning, a vector is a DNA molecule used as a vehicle to artificially carry foreign genetic material into another cell, where it can be replicated and / or expressed (e.g. - plasmid, cosmid, Lambda phages). A vector containing foreign DNA is termed recombinant DNA . The four major types of vectors are plasmids, viral vectors, cosmids, and artificial chromosomes . Of these, the most commonly used vectors are plasmids . Common to all engineered vectors are an origin of replication, a multicloning site, and a selectable marker . </P> <P> The vector itself is generally a DNA sequence that consists of an insert (transgene) and a larger sequence that serves as the "backbone" of the vector . The purpose of a vector which transfers genetic information to another cell is typically to isolate, multiply, or express the insert in the target cell . All vectors may be used for cloning and are therefore cloning vectors, but there are also vectors designed specially for cloning, while others may be designed specifically for other purposes, such as transcription and protein expression . Vectors designed specifically for the expression of the transgene in the target cell are called expression vectors, and generally have a promoter sequence that drives expression of the transgene . Simpler vectors called transcription vectors are only capable of being transcribed but not translated: they can be replicated in a target cell but not expressed, unlike expression vectors . Transcription vectors are used to amplify their insert . </P>

What is the difference between plasmid and vector
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