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Question

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

A
vector
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B
selectable marker
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C
plasmid
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D
probe
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Solution

The correct option is D probe
A single-stranded nucleic acid tagged with a radioactive molecule is called a probe. Probes are 15-30 base long radioactive labeled oligonucleotides (RNA or DNA) used to detect complementary nucleotide sequence, e.g. used for disease diagnosis, etc.
A vector is a DNA molecule used as a vehicle to artificially carry foreign genetic material into another cell, where it can be replicated and/or expressed (e.g.- plasmid, cosmid, Lambda phages). A vector containing foreign DNA is termed recombinant DNA.
A selectable marker is a gene introduced into a cell, especially a bacterium or to cells in culture, that confers a trait suitable for artificial selection.

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