The Expression of the Lac Structural Genes Is _______ When

question 161

Multiple Choice

The expression of the lac structural genes is _______ when lactose is absent from the culture medium and is _______ when lactose is added, because lactose binds to the _______ and inactivates it.

• A) low; high; lac repressor
• B) high; low; lac inducer
• C) low; high; lac promoter
• D) high; low; lac operator
• E) low; high; lac operator

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