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A student cuts both vector and gene with EcoRI. What is the main advantage?

Answer and explanation

Correct answer: Both can get compatible sticky ends

The direct answer is A: both can get compatible sticky ends. A restriction enzyme cuts DNA at a particular recognition sequence. EcoRI cuts the vector and the gene at its recognition sites and usually leaves short single-stranded overhangs called sticky ends. Because the same enzyme makes matching bases exposed on both DNA pieces, the gene can temporarily pair with the vector by complementary base pairing. DNA ligase can then seal the sugar-phosphate backbones and form recombinant DNA. Option A is correct because compatible ends make joining easier and more specific. Option B is wrong: cutting DNA does not convert either DNA molecule into a protein; proteins are made from amino acids. Option C is wrong: cell walls are cellular structures, not products formed by restriction digestion. Option D is wrong: DNA is not changed into water by an enzyme cut. The complete process is cut, allow matching ends to pair, and seal with ligase. Memory cue: same cutter, matching sticky ends, easier joining.

Related tags

EcoriCompatible EndsCloning

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