A plasmid that contains separate origins of replication for two different species is called a(n) ________.
A) R factor
B) expression vector
C) viral vector
D) shuttle vector

Question

Quizplus · Accepted Answer

A shuttle vector is a plasmid that contains separate origins of replication for two different species, usually bacteria and yeast or bacteria and mammalian cells. This allows the same vector to be used for cloning and expression in both types of organisms. Choice A (R factor) refers to a plasmid that carries antibiotic resistance genes and can confer resistance to bacteria. Choice B (expression vector) is a type of plasmid that is designed for high levels of gene expression in a specific host organism. Choice C (viral vector) is a type of vector that can infect cells and transfer genetic material into them, often used in gene therapy.

A Plasmid That Contains Separate Origins of Replication for Two