Question

From which organism was the first restriction enzyme isolated?

• A. Escherichia coli
• B. Salmonella typhimurium
• C. Bacillus cereus
• D. Staphylococcus aureus

Answer 1

Answer:

A. Escherichia coli

• The restriction enzymes are molecular scissors that cleave the DNA at specific recognition sites.

• They were first isolated from Escherichia coli in the year 1963.