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What is special about a multiple cloning site?

Answer and explanation

Correct answer: It has many restriction enzyme sites

The direct answer is B: a multiple cloning site contains many restriction-enzyme recognition sites. A restriction enzyme cuts DNA at its own specific sequence. In an MCS, several different recognition sequences are placed close together in a short region. This gives the researcher choices: an enzyme can be selected that cuts the insert and vector suitably, sometimes producing compatible ends and useful orientation. Option B is correct. Option A is wrong because an MCS is a DNA sequence region, not a protein. Option C is wrong because it does not contain only water; it is made of DNA bases. Option D is wrong because an MCS is specifically part of the vector DNA, not a DNA-free region. The sites should be arranged so that unwanted cutting elsewhere in the vector is avoided. Memory cue: multiple cloning site means many enzyme doors for one insert.

Related tags

McsRestriction SitesInsert Cloning

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