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Answer: 1. Probe

Key idea: A cloning vector carries foreign DNA into a host and replicates there.

BAC (bacterial artificial chromosome), YAC (yeast artificial chromosome) and pBR322 (a plasmid) are all cloning vectors. A probe is a labelled single-stranded DNA or RNA used to detect a complementary sequence, so it is not a vector. Option 1.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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