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Which option best summarizes restriction enzymes in Class 11 biotechnology?

Answer and explanation

Correct answer: Bacterial enzymes that cut DNA at specific recognition sites

Restriction enzymes are usually obtained from bacteria and function as sequence-specific molecular scissors. Each enzyme recognizes a particular short DNA sequence, called a recognition site, and cuts the phosphodiester backbone at or near that site. The cut may produce sticky ends or blunt ends, which are useful in recombinant DNA work because a desired gene and a vector can be cut in a controlled way. Therefore option A gives the governing concept and is the only biologically relevant summary. Options B, C and D describe unrelated functions: light production, mineral formation and fat storage are not the roles of restriction endonucleases in genetic engineering.

Related tags

Class 11Restriction EnzymesRecombinant DnaPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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