Q. Which vector can clone a small fragment of DNA?
(a) Cosmid
(b) Bacterial artificial chromosome
(c) Yeast artificial chromosome
(d) Plasmid
Solution :
Correct option : D (a) Plasmids are autonomously replicating circular extra-chromosomal DNA. (b) They are the standard cloning vectors and the ones most commonly used. (c) Most general plasmids may be used to clone DNA insert of up to 15 kb in size. (d) One of the earliest commonly used cloning vectors is the pBR322 plasmid. So, the correct answer is option D.