Question

UPSC Prelims 2019 Question:

What is the Cas9 protein that is often mentioned in the news?

1. A molecular scissors used in targeted gene editing
2. A biosensor used in the accurate detection of pathogens in patients
3. A gene that makes plants pest-resistant
4. A herbicidal substance synthesized in genetically modified crops

Answer (Detailed Solution Below)

Option 1: A molecular scissors used in targeted gene editing

Detailed Solution

Explanation:

CRISPR-Cas9 is a unique technology that enables geneticists to edit parts of the genome. Genome editing (also called gene editing) is a group of technologies that give scientists the ability to change an organism's DNA. These technologies allow genetic material to be added, removed, or altered at particular locations in the genome.
CRISPR-Cas9 has a lot of potential as a tool for treating a range of medical conditions that have a genetic component, including cancer, hepatitis B or even high cholesterol.

Therefore, option (1) is the correct answer.

Subject: Science & Technology | Health and Diseases

Latest UPSC Exam 2026 Updates

Last updated on January, 2026

→ Check out the latest UPSC Syllabus 2026 here.

→ Join Vajiram & Ravi’s Interview Guidance Programme for expert help to crack your final UPSC stage.

→ UPSC Mains Result 2025 is now out.

→ UPSC Notification 2026 Postponed for CSE & IFS which was scheduled to be released on 14 January 2026.

→ UPSC Calendar 2026 has been released.

→ UPSC Prelims 2026 will be conducted on 24th May, 2026 & UPSC Mains 2026 will be conducted on 21st August 2026.

→ The UPSC Selection Process is of 3 stages-Prelims, Mains and Interview.

→ Prepare effectively with Vajiram & Ravi’s UPSC Prelims Test Series 2026 featuring full-length mock tests, detailed solutions, and performance analysis.

→ Enroll in Vajiram & Ravi’s UPSC Mains Test Series 2026 for structured answer writing practice, expert evaluation, and exam-oriented feedback.

→ Join Vajiram & Ravi’s Best UPSC Mentorship Program for personalized guidance, strategy planning, and one-to-one support from experienced mentors.

→ UPSC Result 2024 is released with latest UPSC Marksheet 2024. Check Now!

→ UPSC Toppers List 2024 is released now. Shakti Dubey is UPSC AIR 1 2024 Topper.

→ Also check Best UPSC Coaching in India

Tags: Analytical factual UPSC Prelims 2019 UPSC Prelims 2019 Question