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Biology Biotechnology Principles and Processes NCERT Single Correct MCQ
Published on: August 12, 2026

An important feature in a plasmid to be used as a vector in genetic engineering is

A
origin of replication
B
presence of a selectable marker
C
presence of sites for restriction endonucleases
D
its size

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The correct answer is:
D

A good plasmid vector must have:

Origin of replication (ori)

Selectable marker

Restriction sites (multiple cloning sites)

But size alone is not a key functional feature for selection, so it is not an essential requirement compared to others.

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