In a Bacterial Cell,the Three Genes of the Lactose Operon

question 32

Multiple Choice

In a bacterial cell,the three genes of the lactose operon are

• A) expressed continuously.
• B) expressed only when lactose is absent.
• C) expressed when lactose synthesis is required.
• D) expressed only in the presence of lactose.
• E) never expressed, because they are pseudogenes.

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