RRaahUPSC
2019 · Science & TechnologyPrevious Year Question
Q49.
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
Answer

A

Explanation

• CRISPR-Cas9 is a system used by bacterial cells to recognise and destroy viral DNA as a form of adaptive immunity. Using components of the CRISPR system, researchers can remove, add or alter specific DNA sequences in the genome of higher organisms. • The gene editing tool has two components — a single-guide
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