Types of Cloning VectorsCloning is generally performed using Escherichia coli, and cloning vectors in E. coli include plasmids, bacteriophages, cosmids, and bacterial artificial chromosomes (BACs). Some DNA, however, cannot be stably maintained in E. coli, for example very large DNA fragments. In this case, other organisms such as yeast may be used. Cloning vectors in yeast include yeast artific..