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Why can confusion occur in names like EcoRI and EcoRV?

Answer and explanation

Correct answer: Names are similar but enzymes are different

The direct answer is A: the names look similar, but EcoRI and EcoRV are different restriction enzymes. To understand this, restriction enzymes are proteins that recognise particular DNA base sequences and cut DNA at or near those sequences. In the name EcoRI, “Eco” refers to the organism from which the enzyme was obtained, while the remaining letters and Roman numeral identify a particular enzyme. EcoRV has a different recognition sequence and can produce a different kind of DNA end from EcoRI. Option A is correct because similar names do not mean identical enzymes. Option B is wrong: they are not always the same enzyme. Option C is wrong: restriction enzymes are not DNA ligases; ligase joins DNA fragments. Option D is wrong: they are not proteinases, which digest proteins. Always read the complete enzyme name and check its recognition site and cut pattern. Memory cue: similar name, separate enzyme, specific site.

Related tags

EcoriEcorvEnzyme Confusion

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