Biology Biotechnology Principles and Processes Tools Of Recombinant DNA Technology Single Correct MCQ
Published on: August 21, 2026

Recombinant DNA bearing ampicillin resistance gene is passed in E.coli. The latter are spread on agar plates containing ampicillin. Then:

A
Transformed recipient cells grow and untransformed cells die
B
Transformed recipient cells die and untransformed cells grow
C
Both transformed and untransformed
D
Both transformed and untransformed cells grow

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Verified by Experts
The correct answer is:
A

The recombinant DNA carries an ampicillin resistance gene (ampᴿ). When E. coli cells are spread on agar containing ampicillin:

Transformed cells (with recombinant plasmid) → resistant → survive and grow.

Untransformed cells (without plasmid) → sensitive → killed by ampicillin.

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