Biology Biotechnology Principles and Processes All Topic Question For Revision Test Single Correct MCQ
Published on: August 11, 2026

pBR-322 which is frequently used as a vector for cloning gene is–

A
an original bacterial plasmid
B
a modified bacterial plasmid
C
a viral genome
D
a transposon

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Text Solution

Verified by Experts
The correct answer is:
B

pBR322 is one of the most commonly used cloning vectors in genetic engineering. It is an artificially modified plasmid derived from a bacterial plasmid and contains:

• Origin of replication (ori)

• Ampicillin resistance gene (amp R )

• Tetracycline resistance gene (tet R )

• Several unique restriction sites for insertion of foreign DNA.

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