Which of the statement is true for pBR322?

A. It contains only an ampicillin resistance gene

B. It contains both ampicillin resistant and tetracycline-resistant gene

C. The cloning site is present only in the ampicillin-resistant gene

D. It is a natural vector

Explanation: pBR 322 is the man-made vector. It contains both ampicillin-resistant and tetracycline-resistant genes. The cloning site is also present in both of the genes.

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