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How does a type II restriction enzyme generate blunt ends?

A. It cuts both strands in the middle of a recognition site.
B. It cuts only one strand up to 25 base pairs away from the recognition site.
C. It cuts both strands to have unpaired nucleotides.
D. It cuts only one strand in the middle of a recognition site.

Respuesta :

Answer:

Type II restriction enzymes are the familiar ones used for everyday molecular biology applications such as gene cloning and DNA fragmentation and analysis. These enzymes cleave DNA at fixed positions with respect to their recognition sequence, creating reproducible fragments and distinct gel electrophoresis patterns. Over 3,500 Type II enzymes have been discovered and characterized, recognizing some 350 different DNA sequences. Thousands more ‘putative’ Type II enzymes have been identified by analysis of sequenced bacterial and archaeal genomes, but remain uncharacterized.

Explanation:

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