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What are neoschizomers?

Answer and explanation

Correct answer: Enzymes cutting at different positions within the same recognition sequence

The direct answer is option B: neoschizomers are restriction enzymes that recognize the same DNA sequence but cut at different positions within that sequence. First distinguish recognition from cutting: an enzyme identifies a particular base sequence, then cuts the DNA at a specified location. In neoschizomers, the recognition sequence is the same, but the cut locations differ, so the ends produced may differ. Option B is correct because it gives both defining features. Option A is wrong because starch-digesting enzymes are amylases, not neoschizomers. Option C is wrong because enzymes that join DNA are ligases, whereas restriction enzymes cut DNA. Option D is wrong because lipid-making enzymes have no connection with this restriction-enzyme classification. A careful student should not assume that the same recognition sequence always means the same cut position. Memory cue: “neo” means new or different here—the site is the same, but the cut is different.

Related tags

NeoschizomersCut PositionRestriction Enzymes

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