Question

A probe which is a molecule used to locate specific sequences in a mixture of DNA or RNA molecules could be.

• A. A single stranded RNA
• B. A single stranded DNA
• C. Either RNA or DNA
• D. Can be ssDNA/ssRNA but not dsRNA/dsDNA

Answer 1

The correct option is D Can be ssDNA/ssRNA but not dsRNA/dsDNA

A probe is a single-stranded fragment of DNA or RNA that are radioactively labeled and are used to locate particular gene sequences by means of complementary binding to them. They can, therefore, be either DNA or RNA sequences but must be single-stranded since double-stranded DNA or RNA will not be able to bind by complementary binding.

So, the correct answers are 'Can be ssDNA/ssRNA but not dsRNA/dsDNA'