Restriction endonucleases
Correct answer: D. Are synthesized by bacteria as part of their defense mechanism.
- A. Are present in mammalian cells for degradation of DNA when the cell dies
- B. Are used in genetic engineering for ligating two DNA molecules
- C. Are used for in vitro DNA synthesis
- D. Are synthesized by bacteria as part of their defense mechanism.
Explanation
Restriction endonucleases are enzymes that digest double stranded DNA following recognition of specific nucleotide sequences. This is achieved by cleaving the two phosphodiester bonds, one within each strand of the DNA duplex. They are found in bacteria and their function in bacteria is to cut up any invading virus as a part of its defense mechanism, thus restricting the multiplication of viruses in the bacterial cell. Different species of bacteria produce different restriction endonucleases.
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