Question

Which of the following bacteria is not a source of restriction endonuclease?

• A. Bacillus amyloliquefaciens
• B. Haemophilus influenzae
• C. Entamoeba coli
• D. Escherichia coli

Answer 1

The correct option is C Entamoeba coli

Haemophilus influenzae:

The restriction enzyme isolated from Haemophilus influenzae is Hind II, Hind III.

Escherichia coli:

The restriction endonuclease isolated from E. coli is EcoR I.

Entamoeba coli:

Entamoeba coli is a protozoan from which no restriction enzyme has been isolated.

Bacillus amyloliquefaciens:

The restriction enzyme isolated from Bacillus amyloliquefaciens is BamH I.

Final answer:

c. Entamoeba coli