Question

Which of the following statements does not hold true for restriction enzyme?

• A. It recognises a palindromic nucleotide sequence
• B. It is an endonuclease
• C. It is isolated from viruses
• D. It produces the same kind of sticky ends in different $DNA$ molecules

Answer 1

Answer: (C)

It is isolated from viruses

Answer 2

More than $900$ restriction enzymes have been isolated from over $230$ strains of bacteria each of which recognise different recognition sequences. No restriction enzyme is isolated from viruses.