What is the major difference between cloning vectors and primary vectors?

What is the major difference between cloning vectors and primary vectors? Correct Answer Presence of promoter

The major difference is the presence of suitable promoter before the DNA insert. In case of an expression vector the main motto is the production of protein thus a promoter in essential criteria but in case of the cloning vector it is mainly used for amplification and/or production of library.

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Topoisomerse I is also used for cloning of PCR product at times. Which of the statement holds true for such type of cloning?
TA cloning is a method used for cloning of PCR products. Which of the statement is correct with respect to it?