A) Contain drug resistance markers.
B) Contain telomeres.
C) Contain regulatory regions that permit the cloned DNA to produce a gene product.
D) Contain origin of DNA replication.
Correct Answer: C
Solution :
Expression vectors may contain drug resistance markers, telomeres, and must contain DNA origins but none of these features distinguish them from other vectors. Expression vectors are unique because they contain regulatory sequences that allow the cloned gene to be expressed in the host cell.
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