Question

Which one of the following statements is incorrect about restriction endonucleases?

• A. They serve as primitive form of immune system in bacteria.
• B. They digest the DNA non-randomly.
• C. They digest the DNA at specific location.
• D. They digest the DNA from free ends.

Answer 1

The correct option is D They digest the DNA from free ends.

Restriction endonuclease is an enzyme that digest the DNA into fragments non-randomly. It cleaves the DNA at specific location called as restriction sites within the molecule. It is present in bacteria and archaea. It serves as a primitive form of immune system in bacteria as it prevents against invading viruses.

Thus, the correct answer is option D.