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Question

DNA or RNA segment tagged with a radioactive molecule is called

A
vector
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B
probe
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C
clone
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D
plasmid
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Solution

The correct option is B probe
Molecular probes are small DNA and RNA segments that are used to detect the presence of complementary sequences in nucleic acid samples. These are usually formed of 200 – 500 nucleotide sequences but may have up to 500 nucleotides. These segments or probes are labeled either with radioactive or with nonradioactive compound. Probes are used for identification and isolation of DNA and RNA.

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