Question

Cosmid is

• A. Circular extranuclear DNA of bacteria
• B. Extragenetic material in mycoplasma
• C. Fragment of DNA inserted in bacteria for forming its copies
• D. Fragment of genetic material inserted in cells to replace defective genes

Answer 1

Answer: (C)

Fragment of DNA inserted in bacteria for forming its copies

A cosmid, first described by Collins and Hahn in 1978, is a type of hybrid plasmid (often used as a cloning vector) that contains cos sequences, DNA sequences originally from the Lambda phase. Cosmids can be used to build genomic libraries.