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Question

A cosmid is a

A
naturally occurring vector
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B
vector constructed using plasmid DNA and cos site of Lambda phage DNA
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C
plasmid DNA with RNA
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D
none of the above
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Solution

The correct option is B vector constructed using plasmid DNA and cos site of Lambda phage DNA
Cosmids can be used to clone DNA fragments up to 45 kb in length. A cosmid is a type of hybrid plasmid that contains a Lambda phage cos sequence. The DNA sequences of Cosmids (cos sites + plasmid = cosmids) are originally from the lambda phage. They are often used as a cloning vector in genetic engineering

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