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

vector

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selectable marker

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plasmid

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probe

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Solution

The correct option is D probe
Probes are single stranded radioactively labelled molecules of nucleic acids with a known sequence. These probes have a complementary sequence to the gene to be identified. Therefore, they bind with the particular gene segment. Radiation imaging identifies the location of that particular segment that is able to bind with probe. Probes are very useful DNA identification tools.

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