Question
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It is advantageous to use a vector having multiple cloning sites, as it
A. Contains many copies of a cloned gene
B. Contains many copies of the same restriction enzyme site
C. Allows flexibility in the choice of restriction enzymes
D. Allows flexibility in the choice of genes for cloning

Answer
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Hint:cloning vector could be a little piece of DNA that may be stably maintained in AN organism, and into that, a distant polymer fragment is often inserted for biological research functions. The biological cloning vector is also DNA taken from an outbreak, the cell of a better organism, or it's going to be the inclusion body of a microorganism.

Complete answer:
A multiple cloning site (MCS), additionally referred to as a polylinker, is a short section of deoxyribonucleic acid that contains several (up to ~20) restriction sites - a typical feature of built plasmids. Restriction sites at intervals AN MCS are generally distinctive, occurring just one occasion at intervals a given cellular inclusion. the aim of an MCS in a very cellular inclusion is to permit a bit of deoxyribonucleic acid to be inserted into that region.
An MCS is found in a very kind of vectors, together with biological research vectors to extend the number of copies of target deoxyribonucleic acid, and in expression, vectors to form a supermolecule product. In expression vectors, the MCS is found downstream of the promoter.
Multiple cloning sites are a feature that permits for the insertion of foreign deoxyribonucleic acid while not disrupting the remainder of the inclusion body that makes it extraordinarily helpful in biotechnology, engineering, and genetics. MCS will aid in creating transgenic organisms, a lot of usually referred to as genetically modified organisms (GMO) using biotechnology. To require advantage of the MCS in biotechnology, a sequence of interest needs to be added to the vector throughout production.

So, option A) is the correct answer.

Note: This region contains many restriction endonuclease recognition sites terribly about to one another. every one of those sites cuts the cellular inclusion just once. Hence, cutting the cellular inclusion with one in every of these restriction enzymes doesn't disrupt any of its essential options, and should serve to insert the foreign DNA.