Biology Biotechnology Principles and Processes All Topic Question For Revision Test Single Correct MCQ
Published on: August 13, 2026

Plasmid has been used as vector because

A
both its ends show replication.
B
it can move between prokaryotic and eukaryotic cells.
C
it is circular DNA which have capacity to join to eukaryotic DNA.
D
it has antibiotic resistance gene.

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The correct answer is:
D

Plasmids are used as vectors in genetic engineering because they carry selectable marker genes, commonly antibiotic resistance genes, which help identify and select transformed cells.

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