LIFE SCIENCE

Detailed explanation-1: -Bacteria use restriction enzymes for their own protection. The viruses which invade the bacteria (bacteriophages) are acted upon by the bacterial restriction enzymes. These enzymes cut the viral DNA into pieces so that viral replication is prevented.

Detailed explanation-2: -Restriction enzymes, also called restriction endonucleases, recognize a specific sequence of nucleotides in double stranded DNA and cut the DNA at a specific location. They are indispensable to the isolation of genes and the construction of cloned DNA molecules.

Detailed explanation-3: -In genetic engineering, restriction enzymes are used for cutting DNA fragments. A restriction enzyme (or restriction endonuclease) is an enzyme that cuts any DNA at or near specific recognition nucleotide sequences (known as restriction sites).