Correct Answer: D
Explanation:
Bacteria synthesize restriction endonucleases.
Restriction enzymes, also known as restriction endonucleases, are enzymes that cut a DNA molecule at a particular place. These are found in bacteria (and harvested from them for use).
They are essential tools for recombinant DNA technology. The enzyme "scans" a DNA molecule, looking for a particular sequence, usually of four to six nucleotides.