Physics NEET Full Syllabus Mock Test 180 Question New Syllabus Mock Test - 9 PCB MCQ (Single Correct)

If two DNA samples are cut with different restriction enzymes (e.g., EcoRI and BamHI), what will happen when their fragments are mixed?

A
They will ligate efficiently due to compatible sticky ends
B
They will hybridize only at blunt ends
C
They will form circular DNA without ligase
D
They will not ligate because their sticky ends are incompatible

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Verified by Experts
The correct answer is:
D

EcoRI produces 5'-AATTC-3' sticky ends. BamHI produces 5'-GATCC-3' sticky ends. Since the overhangs are not complementary, the fragments will not hybridize. For successful ligation, the same enzyme must be used to generate matching sticky ends

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