A vector with a genome consisting of the cos fragments of phage lambda flanking exogenous DNA would be known as a:

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A vector with a genome consisting of the cos fragments of phage lambda flanking exogenous DNA is called a cosmid vector. This is because it contains the cos sites necessary for packaging the DNA into a phage head, but also has the larger size capacity of a plasmid vector.

A Vector with a Genome Consisting of the Cos Fragments