Question

Restriction endonucleases are the enzymes that make site specific cuts in the DNA. The first restriction endonucleus was isolated from _______________

• A. Bacillus amyloliquefaciens
• B. E.coli
• C. Haemophilia influenzae
• D. Thermus aquaticus

Answer 1

Answer:

C. Haemophilia influenzae

The first restriction endonuclease to be isolated was Hind II, which was extracted from the bacterium Haemophilus influenzae in 1970. Restriction endonucleases are enzymes that cut DNA at specific sites. They are found in archaea and bacterial cells and are part of the restriction-modification system, which is a protective mechanism.