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Why is using sterile tools important in genetic engineering?

Answer and explanation

Correct answer: To prevent contamination by unwanted microbes

The correct answer is A: sterile tools prevent contamination by unwanted microorganisms. Genetic-engineering experiments use small amounts of DNA, cells, and carefully selected cultures. If bacteria, fungi, or other unwanted microbes enter through dirty tools, they may grow, consume nutrients, alter the culture, or introduce unwanted DNA. Then the observed result may not come from the intended experiment. Sterilisation and aseptic handling reduce this risk. Option A is correct because cleanliness protects the sample and improves reliability. Option B is wrong because DNA has no need to become sweet and sterility does not add taste. Option C is wrong because sterile tools do not change an enzyme's colour. Option D is wrong because sterilisation does not turn gel into stone; gels are prepared with particular chemicals and conditions. Exam cue: sterile means free from unwanted living contaminants, not chemically sweeter or harder.

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SterilityLab-SafetyEasy

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