Genetic scissors, also known as restriction enzymes, are proteins that act as molecular scissors. They are used to cut strands of DNA at specific locations along the DNA molecule. Genetic glue, also known as ligase, is an enzyme that helps to join two pieces of DNA together. It is used to join two pieces of DNA that have been cut by restriction enzymes. Genetic scissors and glue are tools used in genetic engineering, a process in which DNA from one organism is inserted into another organism.