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STD 12 - 9. biotechnology principlas and process — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 9. biotechnology principlas and process1 Mark
MCQ
Restriction endonucleases are
  • 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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