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

The presence of a plasmid in a bacterial culture is usually determined by

A
blue-white screening
B
growth in the presence of an antibiotic
C
a restriction enzyme digests
D
agarose gel electrophoresis

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The correct answer is:
B

Plasmids usually carry antibiotic resistance genes. Bacteria containing the plasmid can grow on a medium containing that antibiotic, while bacteria without the plasmid cannot.

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