Which of the following is not present in the β-galactosidase structural gene and thus is not transcribed by the same promoter?

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1.	Which of the following is not present in the β-galactosidase structural gene and thus is not transcribed by the same promoter?
A.	Lac A
B.	Lac I
C.	Lac Z
D.	Lac Y
Answer» C. Lac Z

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