Where do restriction enzymes come from in nature and what is their biological function?

Related questions

• What is a restriction enzyme?
• Why must you use the same restriction enzyme on the cell dna and on the plasmid?
• What determines where a restriction endonuclease "cuts" two DNA molecules at the same location?
• What type of organism produces restriction enzymes?
• Why are most restriction enzymes reactions performed at 37 degrees Celcius?
• Why are restriction enzymes kept in 50% glycerol solution?
• How do restriction enzyme cut at specific sequences?
• Do restriction enzymes cut both forward and backward?
• What is a biological function of restriction enzyme?
• If you have a restriction enzyme that cuts a piece of DNA at two recognition sites, how many DNA...