Restriction endonucleases are

MCQ

A
Present in mammalian cells for degradation of $DNA$ when the cell dies
B
Used in genetic engineering for ligating two $DNA$ molecules
C
Used for in vitro $DNA$ synthesis
✓
Synthesized by bacteria as part of their defence mechanism

✓

Answer

Correct option: D.

Synthesized by bacteria as part of their defence mechanism

d
Restriction enzymes are degradative enzymes, which recognize and cut up $DNA$ that is foreign to a cell. These enzymes protect bacteria against intruding $DNA$ from other organisms such as virus or other bacterial cells.

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