Multiple choice

Which of the following is a molecular scissor?

  1. Glucose oxidase

  2. Isocitrate dehydrogenase

  3. Homoserine dehydrogenase

  4. EcoRI
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D Correct answer
Explanation

Restriction enzymes like EcoRI are called 'molecular scissors' because they cut DNA at specific recognition sequences (EcoRI cuts at GAATTC). This ability to precisely cleave DNA makes them essential tools in genetic engineering for creating recombinant DNA. Glucose oxidase, isocitrate dehydrogenase, and homoserine dehydrogenase are metabolic enzymes, not nucleases.

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