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

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

(a) Vector

(b) Selectable marker

(c) Plasmid

(d) Probe

Solution :

Correct option : D 
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.