Name any two natural cloning vectors. Give reasons that make them act as cloning vectors. Write the two characteristics the engineered vectors are made to possess.

Plasmids and bacteriophages are examples of natural cloning vectors. They possess qualities required for a vector.
Cloning vectors should have:
1. Origin of Replication
2. Selectable markers i.e the trait inside the cells that enables it to be selected or identified.
3. Cleavage sites for restriction endonuclease.
Engineered vectors: These type of vectors also possess all the characters mentioned above. Engineered vectors have multiple cloning site or polylinker.