Question:
Restriction enzymes are
Restriction enzymes are
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Restriction enzymes protect bacteria from invading viruses.
Updated On: Nov 12, 2026
- used for artificial DNA synthesis.
- used for sealing the DNA fragments in r DNA technology.
- synthesized by bacteria as a part of their defence mechanism.
- present in eukaryotic cell for degradation of DNA during infection.
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
Restriction endonucleases occur naturally in bacteria.
Step 2: Natural role
They cut the DNA of invading bacteriophages at specific recognition sites, while the bacterium protects its own DNA by methylation. This is a defence mechanism.
Step 3: Other options
DNA synthesis is done by DNA polymerase, and sealing of fragments is done by DNA ligase. They are not eukaryotic defence enzymes.
Final Answer:
Restriction enzymes are synthesized by bacteria as a defence mechanism. \[ \boxed{\text{(C) }\text{synthesized by bacteria as a part of their defence mechanism}} \]
Restriction endonucleases occur naturally in bacteria.
Step 2: Natural role
They cut the DNA of invading bacteriophages at specific recognition sites, while the bacterium protects its own DNA by methylation. This is a defence mechanism.
Step 3: Other options
DNA synthesis is done by DNA polymerase, and sealing of fragments is done by DNA ligase. They are not eukaryotic defence enzymes.
Final Answer:
Restriction enzymes are synthesized by bacteria as a defence mechanism. \[ \boxed{\text{(C) }\text{synthesized by bacteria as a part of their defence mechanism}} \]
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