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Home› UPSC CSE› Prelims GS Paper I› 2019 questions› Question 6

UPSC CSE Prelims

Subject: Technology Chapter: Biotechnology And Intellectual Property Rights (IPR)

2019 PYQ

Question 6

What is Cas9 protein that is often mentioned in news?

Choose one answer AA molecular scissors used in targeted gene editing BA biosensor used in the accurate detection of pathogens in patients CA gene that makes plants pest-resistant DA herbicidal substance synthesized in genetically modified crops

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View correct answer and explanation

Correct answer: A

Correct Option: A Explanation: CRISPR-associated Cas9 is a programmable DNA-cutting enzyme guided by RNA to chosen genome sites, enabling targeted genetic modifications. Option-wise Analysis: A (Correct): Cas9 acts as molecular scissors in CRISPR gene editing. B (Incorrect): Pathogen biosensors are diagnostic devices, not the normal definition of Cas9. C (Incorrect): Cas9 is a protein enzyme, not a plant pest-resistance gene. D (Incorrect): Herbicides act on weeds; Cas9 is not an herbicidal chemical.

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