Q. Which of the following is not a source of restriction endonuclease?

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Solution:

Restriction enzymes are the proteins produced basically by prokaryotes and E. histolytica is a eukaryote that does not possess the enzyme.
Entamoeba histolytica is a protozoan that feeds on cells in the human colon causing amoebic dysentery and colonic ulcerations referred to as amoebiasis.