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1. A restriction enzyme is a ____ that recognizes specific ____ sequences in a ____ molecule, often a ____, and cleaves or nicks the molecule at those sites.
2. A vector is an agent into which a foreign DNA segment is inserted and used to transform host cells. A vector can be created from a virus known as a ____ or a bacterial ____.

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Answer:

1). Bacterial increase, nucleotide, DNA, palindrome

2). Phage, plasmid.

Explanation: A restriction enzyme is one of the key enzymes in gene cloning, example is a restriction endonuclease. A restriction enzyme recognizes and cleaved DNA at specific DNA sequences to generate a set of smaller fragments. The smaller fragments of DNA produced by the restriction enzyme is then inserted into a suitable cloning vector whose DNA molecule has been also cleaved by the same restriction enzyme. The enzyme DNA ligase joins the DNA fragments together. Examples of cloning vectors are plasmids, and bacteriophages (phages)

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