Biology Biotechnology Principles and Processes Cloning Vectors and Competent Host Single Correct MCQ
Published on: August 14, 2026

If recombinant DNA carrying antibiotic resistance gene (e.g. ampicillin) is transferred into E. coli cell, the host cell is transformed into ampicillin resistant cells. The ampicillin resistant gene in this case is called a

A
vectors
B
plasmid
C
selectable marker
D
cloning sites

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The correct answer is:
C

The ampicillin resistance gene allows identification of E. coli cells that have taken up the recombinant DNA, so it functions as a selectable marker.

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