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What does recognition site mean?

Answer and explanation

Correct answer: A specific DNA sequence recognized by an enzyme

Direct answer: Option A is correct. A recognition site is a particular DNA sequence that a specific enzyme can identify by its molecular structure. In genetic engineering, restriction enzymes are especially important examples. Step by step: DNA contains a long sequence of bases; a restriction enzyme checks the sequence as it moves along DNA; when it finds its matching recognition sequence, it binds there; it may cut the DNA at that site or at a nearby defined position; this allows scientists to remove, join, or insert DNA fragments in a planned way. Therefore Option A is correct. Option B is wrong because a cell’s outer shape is a physical feature, not a DNA sequence recognized by a restriction enzyme. Option C is wrong because protein color is not the enzyme’s DNA address. Option D is wrong because nucleus size is a cell-structure feature, not a recognition sequence. Recognition sites are often short and may show special symmetry, but the essential exam idea is a specific DNA sequence recognized by an enzyme. Memory cue: recognition site = the enzyme’s DNA address for finding and cutting.

Related tags

Recognition-SiteRestriction-EnzymeEasy

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