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A single strand of nucleic acid tagged with a radioactive molecule is called:

1. Vector
2. Selectable marker
3. Plasmid
4. Probe

Correct answer: Probe

Solution

A probe is a single-stranded nucleic acid labeled with a detectable tag, such as a radioactive molecule, so it can bind to a complementary sequence. Vectors, selectable markers, and plasmids are cloning tools or DNA elements, not labeled detection strands.

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