Question

In the $E.coli$ cloning vector $pBR322$, the number of selectable marker is

• A. $4$
• B. $1$
• C. $2$
• D. $3$

Answer 1

Answer: (C)

In the E. coli cloning vector pBR $322$, the number of selectable marker are two ($am{p}^R$ and $te{t}^R$ gene).