Restriction endonuclease:
Correct answer: C. Cuts the DNA molecule at specific sites
- A. Synthesizes DNA
- B. Cuts the DNA molecule randomly.
- C. Cuts the DNA molecule at specific sites
- D. Restricts the synthesis of DNA inside the nucleus.
Explanation
Restriction endonucleases were found by Arber in 1962 in bacteria. They act as "molecular scissors" or chemical scalpels. They recognize the specific base sequence at palindrome sites in DNA duplex and cut its strands. For example, restriction endonuclease EcoRI found in the colon bacteria E.coli reocgnizes the base sequence GAATTC in DNA duplex and cuts its strands between G and A.
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