Restriction endonucleases:

Options

A. Used in genetic engineering for ligating two DNA molecules
B. Used for in vitro DNA synthesis
C. Synthesised by bacteria as part of their deense mechanism
D. Present in mammalian cell for degradation of DNA when the cell dies

Answer

C

Explanation

In the bacterial cell, restriction endonuclease recognise and cleaves foreign DNA, thus eliminating infecting organisms.