Cloning Vectors
Charon vectors are different from EMBL vectors because

they have more extensive range of restriction targets with in their polylinkers.
both (a) and (b)
physical separation of lambda arm from central fragment is not required
physical separation of lambda arm from central fragment is required

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Cloning Vectors
Cosmid vectors are

phages that lack cos site
cryptic plasmids
plasmids that contain fragment of λ DNA including the cos site
plasmids that have no selection marker

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