A cloning vector differs from an expression vector because

1) A cloning vector differs from an expression vector because   

A) a cloning vector has a Shine-Delgarno sequence
      
B) a cloning vector has an ori
      
C) a cloning vector has a polylinker
      
D) an expression vector has a Shine-Delgarno sequence
      
E) a cloning vector has a transcription terminator
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2) With PCR, one gene is all that is necessary to create a genetic fingerprint.
A) True
B) False
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3) In blue/white selection, the cells transformed with a piece of DNA inserted into the polylinker turns are the ones that make the colorless sugar analog xgal blue.
A) True
B) Flase