Question

Assertion
Restriction enzymes of different organisms that recognize the identical sequences are called isoschizomers.
Reason
They are present only in eukaryotes.
a) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
b) Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
c) Assertion is correct but Reason is incorrect.
d) Assertion is incorrect but Reason is correct.

Answer 1

Hint: Restriction enzymes are those enzymes that are used to cut the DNA sequence at a specific site. These sites are known as the restriction sites. These enzymes cut DNA into small nucleotides. The enzymes can cut into very small nucleotides as well as can cut long stretches too.

Complete answer:
 The restriction enzymes are those enzymes which are present to cleave the DNA into small segments. When these enzymes cleave at a particular site and recognize the same site that needs to be cleaved then they are labeled as isoschizomers. Restriction enzymes present in the different organisms may recognize the same site of cleaving in the DNA. These restriction enzymes are present in the prokaryotes. Restriction enzymes are classified into four classes on the basis of subunit composition, cleavage position, sequence specificity, and cofactor requirements. Isoschizomers are the pairs of the restriction enzymes that have the same specific recognition sites or the sequences. Like the Sphl and Bbul which are the isoschizomers of each other. These enzymes cut the sites in the same manner. There are some enzymes that have the same recognition sequences but they cleave differently. They are also known as neoschizomer. The Small and Xmal are neoschizomer of each other as they have the same recognition sites but they cleave differently from each other. The name of the restriction enzymes is done by the name of the genus, species, and the strain of the bacteria from which they are obtained from.
So, the answer is ‘Assertion is correct but Reason is incorrect.’

Note: The restriction enzymes are present in the prokaryotes and can be isoschizomer or the neoschizomer. These enzymes cleave at the specific recognition sites. The restriction enzymes are specific in nature