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The sequence that controls the copy number of the linked DNA in the vector, is termed:

1. Ori site
2. Palindromic sequence
3. Recognition site
4. Selectable marker

Correct answer: Ori site

Solution

The ori (origin of replication) is the specific DNA sequence where replication begins, so it determines whether and how efficiently the vector is copied inside the host. Other options relate to restriction enzyme binding, symmetry, or selection, not replication control.

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