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UPSC 2019: What is Cas9 protein that is often mentioned in news?
(a)A molecular scissors used in targeted gene editing
(b)A biosensor used in the accurate detection of pathogens in patients
(c)A gene that makes plants pest-resistant
(d)A herbicidal substance synthesized in genetically modified crops
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Not attemptedCorrect Answer: (a) A molecular scissors used in targeted gene editing
Cas9 is the RNA-guided endonuclease at the heart of the CRISPR-Cas9 system. It acts as ‘molecular scissors’, creating precise double-strand breaks in DNA that permit targeted gene knock-out, insertion or correction. It is neither a biosensor, a pest-resistance gene, nor a herbicide. Hence option (a) is correct. ([edukemy.com](https://edukemy.com/blog/upsc-prelims-2019-question-99/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2019 Science & Technology question?▼
The correct answer is option (a): A molecular scissors used in targeted gene editing. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Biotechnology & Genetics question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2019, GS Paper 1, as Question 99. It falls under Science & Technology > Biotechnology & Genetics.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Biotechnology & Genetics?▼
UPSC has asked 54 questions from Biotechnology & Genetics (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.