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Why are sterile tools used in genetic engineering?

Answer and explanation

Correct answer: To protect samples from unwanted microbes

The governing concept is aseptic technique and prevention of contamination. Genetic engineering experiments often use small quantities of DNA, living host cells, enzymes, and selective culture media. If bacteria, fungi, nucleases, or other unwanted microorganisms enter through an unsterile tool, they may destroy DNA, compete with the intended host, alter the culture, or produce misleading results. Sterilising tools and maintaining clean working conditions therefore protect the sample and preserve experimental reliability. Option A is correct. Sterility does not make DNA shiny, lengthen primers, or increase plasmid mass; those changes require entirely different chemical or molecular processes.

Related tags

Sterile TechniqueContaminationBiosafetyGenetic EngineeringPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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