UPSC CAPF AC 2026 Paper 1 · Question 89
Question 89 of the UPSC CAPF (AC) 2026 Paper I (19 July 2026). Try it first, then open the answer and explanation.
Consider the following statements about genetic engineering: 1. The technique of genetic engineering involves creation of recombinant DNA, use of gene cloning and gene transfer. 2. Restriction enzymes cut DNA at specific locations. 3. Restriction enzymes split the entire double-stranded DNA into two strands. Which of the statements given above is/are correct?
- 1 only
- 1 and 2
- 1 and 3
- 2 and 3
आनुवंशिक इंजीनियरी (genetic engineering) के बारे में निम्नलिखित कथनों पर विचार कीजिए : 1. आनुवंशिक इंजीनियरी की तकनीक में पुनर्योगज (recombinant) DNA का निर्माण, जीन क्लोनिंग और जीन स्थानांतरण का उपयोग सम्मिलित है। 2. प्रतिबंधन एंजाइम (restriction enzymes) DNA को विशिष्ट जगहों पर काटते हैं। 3. प्रतिबंधन एंजाइम (restriction enzymes) संपूर्ण द्विलड़ीय (double-stranded) DNA को दो लड़ियों में विखंडित करते हैं। उपर्युक्त में से कौन-सा/कौन-से कथन सही है/हैं?
- केवल 1
- 1 और 2
- 1 और 3
- 2 और 3
Show answer
Answer: (2) 1 and 2
उत्तर: (2) 1 और 2
Genetic engineering involves making recombinant DNA, gene cloning and gene transfer, and restriction enzymes ("molecular scissors") cut DNA at specific recognition sequences, so statements 1 and 2 are correct. Statement 3 is wrong: a restriction enzyme cuts across both strands at its recognition site to give DNA fragments; it does not separate the double helix into two single strands (that is done by heat denaturation or helicase).