Assertion: Restriction enzymes of different organisms that recognize the identical sequences are called isoschizomers. Reasoning:: They are present only in eukaryotes.

Both Assertion (A) and Reason (R) are correct and R is the correct explanation of A. Both Assertion (A) and Reason (R) are correct but R is not the correct explanation of A. Assertion (A) is true but Reason (R) is not correct. Both Assertion (A) and Reasoning are false (F ).

Assertion (A) is true but Reason (R) is not correct.

An isoschizomer is an enzyme that recognizes the same sequence as another. A maximum number of 8-10 most common isoschizomers are indicated for every enzyme. Restriction enzymes from different organisms may recognize the same DNA sequence. If the enzymes recognize the same site and cleave at the same position, they are labeled isoschizomers. Isoschizomers are isolated from different bacterial species or strains. They are present in prokaryotes. Isoschizomer are pairs of restriction enzymes specific to the same recognition sequence. e.g., SphI (CGTAC/G) and BbuI (CGTAC/G) are isoschizomers of each other. These are isolated from different strains of bacteria.