Ncert Exercises & Solutions

A probe, which is a molecule, used to locate homologous sequences in a mixture of DNA or RNA molecules could be:
1. an ssRNA
2. an ssDNA
3. either RNA or DNA
4. can be ssDNA but not ssRNA

(3) A probe is a single stranded DNA or RNA tagged with a radioactive molecule. It is used to detect the complementary sequences by hybridisation techniques.