Biology Biotechnology Principles and Processes Cloning Vectors and Competent Host Single Correct MCQ
Published on: August 13, 2026

The two antibiotic resistance genes on vector pBR322 are for

A
ampicillin and tetracycline
B
ampicillin and chloramphenicol
C
chloramphenicol and tetracycline
D
tetracycline and kanamycin

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Text Solution

Verified by Experts
The correct answer is:
A

pBR322 carries two selectable marker genes:

• amp R → resistance to ampicillin

• tet R → resistance to tetracycline

These allow selection of bacteria that contain the plasmid or recombinant DNA.

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