A Plasmid Contains the Gene for Tetracycline Resistance and a LacZ

question 8

Multiple Choice

A plasmid contains the gene for tetracycline resistance and a lacZ gene that has a restriction site in it.Foreign DNA has the same restriction site at its ends.Host bacteria are transformed with the recombinant DNA and grown on medium with tetracycline and X-Gal.Colonies that are producing -galactosidase and are resistant to tetracycline are carrying

• A) nothing.
• B) only lacZ.
• C) foreign DNA only.
• D) the intact plasmid only.
• E) the plasmid with foreign DNA.

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